ML20137K547

Summary of 851218 Meeting W/Mark III Containment Hydrogen Control Owners Group Re Combustible Gas Control Emergency Procedure Guideline.Attendees List,Draft Emergency Procedure Guideline & Viewgraphs Encl

ML20137K547
Person / Time
Site:	Perry, Grand Gulf, River Bend, Clinton, 05000000
Issue date:	01/17/1986
From:	Kintner L Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20137K553	List: ML20137K547 ML20137K603
References
NUDOCS 8601240130
Download: ML20137K547 (9)

Text

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[o, UNITED STATES

[(, ) m 'j NUCLEAR REGULATORY COMMISSION

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p WASHINGTON, D. C. 20555

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Docket Nos.

50-416/417 50-461 50-458/459 50-440 LICENSEES:

Mississippi Pcver & Light Company Illinois Power Coupany Gulf States Utilities Cleveland Electric Illuminating Certpany FACILITIES:

Grand Gulf Nuclear Station, Units 1 and 2 Clinton, Unit 1 River Bend, Units 1 and 2 Perry, Unit 1

SUMMARY

OF DECEMBER 18, 1965 MEETING WITH MARK III CONTAltTENT HYDROGEN CONTROL OWNERS GROUP (HCCG) REGARDING COMBUSTIBLE GAS CCNTROL EMERGENCY PROCEDURE GUIDELIhE The purpose of the meeting was to discuss the ccrrbustible gas control emergency procedure guideline (EPG) being developed by HCOG for Mark III containments. is a list of attendees. is a draft of the EPC subnitted November 12, 1985 and discussed in the meeting. is a copy of slides used in the meeting.

HC0G presented the principal assumptions used in develeping the EPG (Enclosure 3, Sheet 1). The actions to control ccmbustible gas depend on a determination of hydrogen concentration in the contairrrent and drywell. Hydrogen concentration is determined by hydrogen monitors and analyzers which cbtain samples of air at high and low locations within the containment and the drywell. HC0G said that if the analyzers are not functioning or appear to be giving errcneous readings, air samples can be obtained and analyzed within two hours by use of the post accident sampling system. The staff questioned whether measurements or deter-minations other than hydrogen measurements can be obtained in a timely manner.

HC0G said that reactor water level would be used as an indication of the potential for hydrogen generation.

If the core is covered with water (or water and steam mixture) there would be no expectation of hydrogen release.

In addition, operatcrs would consider other available measurements such as reactor coolant pressure, tempeiature and flow in cetermining hydrogen concentrations. Hcuever, one of the principal assumptions in developing the EPG is that hydrogen concentraticr can be determined. The staff indicated some concern with symptom-oriented guidelines based on hydrcgen concentration measurements. Another principal assumption used in developing the EPG is that igniters should not be operated if (1) the hydrogen reaches a concentration at which deflagration could threaten containment or drywell integrity from overpressurization (hydrogen deflagratien overpressure limit or HDOL) er (2) the hydrogen reaches a concentration at which excessive temperature due to deflagratinn could threaten survivability of equip-ment needed for achieving and maintaining safe shutdown and for maintainir.c conteinrent integrity (hydrogen deflagraticn temperature limit or HDTL).

These limits have not been firmed up, but they are presently estimated as follows: HDTL is in the range of 7-9% hydrogen concentration and HDOL is in 9601240130 860117 PDR ADOCK 05000416 F

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. the range of 9-117 hydrogen contentration. Another principal assumption in developing the EFG is that venting to decrease hycrcgen ccncentration is desirable if the expected radicactivity release offsite is less than the site alert release rate specified in the emergercy plan.

Step 1 in the EPG (PC/H-1) is to actuate igniters if the reactor water level cannot be determined to be abcVe the top of the active fucl (Erclosure 2, Sheet 4 dnd Enclosure 3, Sheet 3).

In respcnse to staff's question regarcir.9 relichility of water level determination, HC0G said that the present BWR emergency procecure guidelines quantify uncertainties in water level measurerents for accident con-ditions (e.g. high temperature in containment) so that the operator would have results of these uncertainty calculations available to make this deternir.ation.

Step 2 in the EPG (PC/H-2) is to vent the containment and drywell i# the bydrogen concentration reaches the minimum detectable concentratiens (0.5%), provided site radioactivity release rate is expected to remain below the site release rate LCO.

(Enclosure 2, Sheet 4 and Encicsure 3, Sheet 4). The staff questicoeo tLe desirability of venting containment when hydrogen concentration is 50 lcw rather than waiting until hydrogen reconbinero could be used (at 1.0!; hydrogen). HCOG said such venting would be included in accunulated hours limited by Technical Specifications.

If the site racicactivity release rate reached the LCO, the containment would be isolated. Mcwever, hCOG said it would consider the use of the recombiner instead of venting for these conditions.

HCOG indicated that Step 2.3 in the EPG (Enclosure 2) should be partitioned, with the action to operate the drywell hydrogen mixers identified as a separctc action (Step 2.4).

The staff inoicated that such a modification wculd cause Step 3.2 to be redundant with the proposed Step 2.4.

HC0G acknowledged the apparent redundancy and inoicated it would reconsider this item.

The staff questioned an apparent inconsistency between Steps 4.1 and 4.3 of the EPG dealing with securing of recombiners. HCOG indicated it would develop the logic for the current guidance or would modify the actions in this area.

Regarding Step 5 (Enclosure 2, Sheet 7 and Enclosure 3, Sheet 8), staff questioned whether the reactor should be depressurized when the HDTL hydrogen concentration is reached, regardless of reactor water level. The concern is that an erroneous hydrogen measurement would dictate an unnecessary manual ADS ectuation and that the period of adequate core cooling would be reduced. HCOG said that is was expected that the reduction in core cccling would be slight and that the threet to eouipment survivability was sufficiently important to offset the risks associated with unnecessary ADS actuation.

The staff questioned whether Steps 6.1 and 7, which deal with containment

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spray actuation, should be conditional to reaching a primary containment pressure of 1.7 psig. HC0G responded that this condition is consistent for other EPG actions requiring actuation of the sprays and is based er certain-nent reverse pressure capabilities. The staff indicated that actuation cf sprays in this instance (Steps 6.1 and 7) shculd not be conditional to the desion reverse pressure capabilities but should reflect ultinate reverse pressure capability.

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. The staff questioned whether the EPG was adequate for directing the operator following completion of actions related to the override control steps, particularly the last override control step dealing with the HDOL. HCOG responded that it would consider development of additional guidance.

Staff also questioned whether igniters should be turned off if radioactivity was so high that venting would not be permitted.

HCOG said there was a greater chance of equirrent survivability with the lower teniperatures expected without deflagra-tion.

In response to staff's question, HCOG said it had not yet analyzed a degraded core accident sequence but plans to develop a sequence as a nieans of 'Jsing Quarter Scale Test Facility test results in the development of the 'PG.

t orinmi sn

..I by L. L. Kintner, Project Manager BWR Project Directorate No. 4 Division of BWR Licensing

Enclosures:

As stated cc: See nc>t page DISTRIBUTION Docket File NRC PDR Local PDR PDf4 Reading WButler LKintner MDuncan Young, GELD EJordan BGrimes ACRS (10)

PD#4/PM PD#4/D I

LKintner:lb WButler D 01/lr/66 01/( b/86

)

f 3-The staff questioned whether the EPG was adequate for directing the operator following completion cf actions related to the override contrcl steps, particularly the last override control step dealing with the HD0L. HC0G j

responded that it would consioer development of addition 61 guidence.

Staff also questicred whether igniters should be turned off if radioactivity was so high that venting wculd not be permitted. HC00 said there was a greater chance of equipment survivability with the lower temperatures expected without ceficgra-tion.

In response to staff's questien, HC0G said it had not yet analyzec a degraded core accident sequence but plans to develop a secuerce as a r.:06ns of using Quarter Scale Test Facility test results in the development of the EPG.

v L. L. Kintner, Project itanager

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BWR Project Directorate fio. 4 Division of BWR Licensing i

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Enclosures:

l As stated l

cc: See next page a

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.,_..____~.__,_,...-,,.___._-_____,_--_,_.,_-,_.y.---,

Mr. Oliver D. Kingsley, Jr.

Mississippi Power & Light Coripany Grano Gulf huclear Staiton cc:

Rcbert B. McGehee, Esquire The Honorable William J. Guste, Jr.

hise, Csrter, Child, Steen and Caraway Attorney General P.O. Box 651 Department of Justice Jackson, Mississippi 39205 State of Louisiana Baton Rouge, Louisiana 70804 hicholas S. Reynolds, Esquire Bishop, Liberman, Cook, Purcell and Reynolds 1200 17th Street, N.W.

Washington, D. C.

20036 Mr. Ralph T. Lally Manager of Quality Assurance Ottice of the Governor Middle Scuth Services, Inc.

State of Mississippi P.O. Box 61000 Jackson,flississippi 39201 New Orleans, Louisiana 70161 Attorney General Mr. Larry F. Dale, Director Gartin Building Nuclear Licensing and Safety Jackson, Mississippi 39205 Mississippi Pcwer & Light Company P.O. Box 23054 Mr. Jack IdcMillan, Director Jackson,flississippi 39205 Solid Uaste flississippi State Board of Health Mr. R. W. Jackson, Project Engineer 880 Lakeland Bechtel Power Corporation Jackson, Mississippi 392C6 15740 Shady Grove Road Gaithersburg, Maryland 28077-1454 Alton B. Cobb, fi.D.

State Health Officer Mr. Ross C. Butcher State Board of Health Senior Resident Inspector P.O. Box 1700 U.S. Nuclear Regulatory Connission Jackson, Mississippi 39205 Route 2, Box 399 Port Gibson, Mississippi 39150 President Claiborne County Board of Supervisors Regional Administrator, Region II Port Gibscn, Mississippi 39150 U.S. Nuclear Regulatory Comission, 101 Marietta Street, N.W., Suite 2900 Mr. Ted H. Cloninger Atlanta, Georgia 30323 Vice President, huclear Engineering and Support Mr. J. E. Cross flississippi Power & Light Cortpary Grand Gulf Nuclear Station Site Director Post Office Box 23054 Mississippi Power & Light Company Jackson, Mississippi 39205 P.O. Box 756 Port Gibson, Mississippi 39150 Mr. C. R. Hutchinson GGNS General kanager Mississippi Power & Light Company Post Office Box 756 Port Gibson, Mississippi 39150

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fir. Frank A. Spangenberg Clinton Pcv.r.r Station Illinois Power Company Unit 1 cc:

Mr. Allen Samelson, Esquire Jean Foy, Esquire Assistant Attorney General 511 W. Nevada Envircontntel Control Division Urbana, Illir.ois 61801 Southern Region 500 Scuth Second Street Richard B. Hubbard Springfield, Illinois 62706 Vice President Technical Associates fir. D. P. Hall 1723 Hamilton Ave. - Suite V.

Vice President San Jose, CA 95125 Clinton Power Staticn P. O. Box 678 Clinton, Illinois, 61727 Mr. H. R. Victor Manager-Huclear Station Engineerirg Dpt.

Clinton Power Station P. O. Box 678 Clinton, Illinois 61727 Sheldon Zabel, Esquire Schiff, Hardin & Waite 7200 Sears Tower 233 Wacker Drive Chicago, Illinois 60606 Resident Inspector U. S. Nuclear Regulatory Commission RR 3. Box 229 A Clinton, Illinois 61727 Mr. R. C. Heider Project Manager Sargent & Lundy Engineers 55 East Monroe Street Chicago, Illinois 60603 Mr. L. Larson Project Manager General Electric Company 175 Curtner Avenue, N/C 395 San Jose, California 95125 1

Regional Administrator, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 l

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4 Mr. William J. Cahill, Jr.

Gulf States Utilities Company River Bend Nuclear Plant f

cc:

Troy B. Conner, Jr., Esq.

Ms. Linda B. Watkins/ fir. Steven Irving Conner and Wetterhahn Attorney at Law 1747 Pennsylvania Avenue, NW 355 Napoleon Street Washington, D.C.

20006 Baton Rouge, Louisiana 70802 Mr. William J. Reed, Jr.

Mr. David Zaloudek Director - Nuclear Licensing Nuclear Energy Division Gulf States utilities Company Louisiara Department of P. O. Box 2951 Enviror. mental Quality Beaumont, Texas 77704 P. O. Box 14690 Baton Rouge, Louisiana 70898 Richard fl. Troy, Jr., Esq.

Assistant Attorney General in Charge Mr. J. David McNeill, III State of Louisiana Department cf Justice William G. Davis. Esq.

234 Loyola Averue Department of Justice New Orleans, Lceisiana 70112 Attorney General's Office 7434 Derkins Read Resident Inspector Saton Rouge, Louisiana 7CECS P. O. Box 1051 St. Francisville, Louisiana 70775 H. Anne Plettinger 3456 Villa Rose Drive Gretchen R. Rothschild Baton Rouge,. Louisiana 70006 Louisianians for Safe Energy, Inc.

1659 Glenmore Avenue Baton Rouge, Louisiana 70775 James W. Pierce, Jr., Esq.

P. O. Box 23571 Baton Rouge, Louisiana 70893 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 i

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fir. Murray R. Edelman Perry Nuclear Power Plant The Cleveland Electric Units 1 ano E Illuminating Company cc:

Jay Silberg, Esq.

Mr. Larry O. Beck Shaw, Pittman, & Trowbridge The Cleveland Electric 1800 M Street, N. W.

Illuminating Company Washington, D. C.

20006 P. O. Box 97 E-210 Perry, Ohio 440E1 Donald H. Hauser, Esq.

The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101 Resioent Inspector's Office U. S. Nuclear Regulatory Commission Parmly at Center Road Perry, Ohio 44081 Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Donald T. Ezzone, Esq.

Assistant Prosecuting Attorney 105 Main Street Lake County Administration Center Painesville, Ohio 44077 Ms. Sue Hiatt 0CRE Interim Representative 8275 Munson Mentor, Ohio 44060 Terry J. Lodge, Esq.

618 N. Michigan Street Suite 105 Toledo, Ohio 43624 John G. Cardinal, Esq.

Prosecuting Attorney

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Ashtabula County Courthouse Jefferson, Ohio 44047 J

Attendees NRC-HCOG Meeting December 18, 1985 Name Affiliation L. L. Kintner NRC/ DBL /PD-4 R. W. Houston NRC/ DBL John Richardson Enercon Services Robert A. Stratman CEI Bob Evans Enercon Services Sam Hobbs Mississippi Pcwer & Light Charles Tinkler NRC/DPL-A/ PAPS Kris Farczewski NRC/DPL-B/PBPE Mike McCoy

?!RC/ DBL /BWRS John Hosler EPRI Rita Sannons NRC/DSR0/ RIB t

Dean Houston flRC/ACRS Emin Ortalan Cleveland Elec. Illum.

Timothy Byan Illinois Power Co.

i Randy Langley Gulf States Utilities Marvin Morris GSU Allen flotafr.ancesco NRC/ DBL /BWPS Jack Kudrick NRC/ DBL /BUPS K. Mali Enercon 1

G. W. Smith MPSL M. Manski MP&L David D. Yue NRC/ DBL / BURS 1

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