ML18127A679

LER 1978-007-00 for St. Lucie Unit 1, Technical Specification 4.3.1.1.3 RTD Response Time

ML18127A679
Person / Time
Site:	Saint Lucie
Issue date:	02/17/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/RGN-II
References
PRN-LI-78-48 LER 1978-007-00
Download: ML18127A679 (5)

Text

VQ REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS >

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC: OREILLY J P ORG: SCHMIDT A D DOCDATE: 02/17/78 NRC FL PWR 5 LIGHT DATE RCVD: 02/27/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1 LICENSEE EVENT REPT (RO 50-335/78-7> ON 02/03/78 CONCERNING TECH SPEC TABI E 3. 3. 2 DOES NOT INCLUDE ALLOWANCE FOR RESISTANCE TEMP DETECTOR- (RTD> RESPONSE TIMEi THEREBY PREVENTING FULL COMPLIANCE FULL COMPLIANCE WITH TECH SPEC 4. 3. i. l. 3 <RESPONSE TIME TEST PLANT NAME: ST LUCIE Ci REVIEWER INITIAL: XJM DISTRIBUTOR INITIAL:

+4++4++4~HF44t++++4t DISTRIBUTION OF 'THIS MATERIAL IS AS FOLLOWS INCIDENT REPORTS (DISTRIBUTION CODE A002>

FOR ACTION: BR CHIEF /4 ENCL INTERNAL: E NRC PDR4~+W/ENCL I 5 E+4W/2 ENCL MIPC4 +W/3,ENCL SCHROEDER/IF'POL I TO~~+W/ENCL HOUSTON4H~W/ENCL NOVAK/CHECK44W/ENCL GR IMES+~~l l/ENCL KNIGHT++W/ENCL BUTLER~H~W/ENCL HANAUER~~~W/ENCL TEDESCO4+W/ENCL EI SENHUT++W/ENCL BAER++W/ENCL SHAO+4W/ENCL VOLLMER/BUNCH++W/ENCL KREGER/J. COLLINS++W/ENCL ROSA++W/ENCL K SEYFR I T/IE++W/ENCL EXTERNAL: LPDR S FT PIERCF FL++W/ENCL TIC++W/ENCL NSIC++W/ENCL ACRS CAT B44W/16 ENCL COPIES NOT SUB~fITTED PER REGULATORY GUIDE 10.1 I

DISTRIBUT1ON: LTR 45 ENCL 45 CONTROL NBR 780590035 SIZE: iP+iP+iP THE END  %%%%%%%WH$ %8l+%%%%%%%%%%%%%%%.

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FLORIDA POPOVER & LIGHT COMPANY February 17, 1978 PRN-LI-78-48 Mr. James P. 0'eilly, Director, Region Ig Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 1217 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

qlsv apron REPORTABLE OCCURRENCE 335-78-7 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: FEBRUARY 3, 197 Oi~'iisil TECHNICAL SPECIFICATION 4.3.1.1.3 RTD RESPONSE TIME The attached Licensee Event Report is being submitted in accordance. with Technical Specification 6.9 to provide prompt notification of the subject occurrence..

Very truly yours,.

A. D. Schmidt Vice President Power Resources MAS/bab Attachment CC Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (40)

Director, Office of Management Information and.

Program Control (3) 78O590035 o 9 PEOPLE... SERVING PEOPLE

LICENSEE EVENT REPORTS coNvooL oLoox: (PLAGE PRIa~JT ALL REQUIRED INFGRMAT!GN) 1 6 LCENSEE UCENSE EVENT NAME LICENSE NUMSER TYPE TYPE o' L S L S 0 0 0l0 0 0 0 o o I I. I> II. x ~o 7 -89 14 15 25 26 30 31 32 REPORT, REPORT CATEGORY TYPE SOURCE COCKET NUMSER EVEN OATS REPORT CATE

~o~ corn' ~T ~i, ol 5 0 0 13 3 5 0 2 0I3 7 8 OI2 1 7I7 8 7 8 57 58 59 60 61 Se S9 74 75 eo EVEIVT OESCRIPTION

~ol2 T chnical Specification Table 3.3-2(Reactor Protective Instrumentation Response Times) 7 8 9 eo Q03 does not include allowance for resistance temperature detector (RTD) response t'me, 7 89 60

~0 < therebv preventing full compliance with Technical Specification 4.3.1.1.3 (response time 7 8 9 oo Qg testin 7 8

.. In addition the RTD res onse times of selected channels are apparently greatef 9 60 tOD~] than the 5-second value initiall used b the NSSS vendor in the applicable setpoint t 7 8 9 MME SYSTEM CAUSE cQM pc'Ie4T COMPONENT COQE CQOE COMPONENT CQOE SUPPUER MAhUF~i

~67 ~II A ~B I N o 1 R U N R 3 7[0 N 7 8 9 10 11 12 17 47 48 C" USE OESCRIPTION

[Oa~j The RTDs are mounted FACTORY in instrument wells. Apparently, changes in the parameters 7 8 9 60 toD9J governing the response of an RTD in an instrument well affect .the overall response time.

7 8 9 60

~1 0 In addition, St. Lucie Unit 1 and other similar plants have had difficulty verifying the 89 METHOO" OF 80 STATUS. dd POWER= OTHER STATUS QISCOVERY OISCOVERY OESCRIPTIQN

~E ~o NA NA 7 8 9 10 12 13 a5 as FORM OF ACTiY CQATENT RELeeSEO OF R=LEASE AMOUNT OF ACTIVITY ~ LOCATICN QF RELEASE 8"

~z NA NA 7 9 .. 10 11 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTICN 7

I11j 8 9 LIMNI 11 L~J 12 13 NA 80 PERSONNEL INJURIES NUMBER CESCRIPTION

~4 ~001 0 NA 7 89 11 12 60 PZOBA8LZ coNSECUENcees 7'9 LOSS OR OAMAGE TO FACIUTY NA 80 TYPE OESC IPOQN

~1IS NA 7 89 10 eo PUSLICITY NA 7 8 9 AOOITIONAL FACTORS QQ a e two for continuation of Event Description and Cause Description.

7 8 9 80 7 99 60 NAME: A. Sc PHONE:

C>0 dd'I 44T

Reportable Occurrence 335-78-7 Licensee Event Report Page Two Event Descri tion (continued) analysis. his is based on measurements made by a consultant in mid-January, 1978. The consultant reported the results on February 3, 1978. Although the measured response times are greater than 5 seconds, they are less than t.he revised value of 8 seconds contained in a proposed Technical Specification amendment which has been submitted to .the 'NRC (see "Cause De-scription"). This is the first occurrence of this type at St. Lucie Unit l. (335-78-7)

Cause Descri tion (continued) 5-second response time assumed in the NSSS setpoint analysis.

As a result of the parametric uncertainties and the measure-ment difficulties, the NSSS vendor had been requested in 1977 to re-evaluate the appropriate setpoints using' response time greater than 5 seconds. In December, 1977 the NSSS vendor responded with an evaluation that supported response times of up to 8 seconds. A proposal to incorporate the 8-second value in Table 3 3-2 was forwarded to the NRC by letter L-78-39 dated, February 2, 1978..

All RTDs tested'ad response times less than 8 seconds, so no further action beyond the Technical Specification change proposal, is planned at this time.