ML19318B908

Responds to IE Bulletin 80-05, Vacuum Condition Resulting in Damage to Chemical Vol Control Sys Holdup Tanks. All Tanks Except Resin Sluice & Primary Drain Tanks Either Will Not Experience or Can Withstand Full Vacuum Conditions

ML19318B908
Person / Time
Site:	Seabrook
Issue date:	06/05/1980
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-80-05, IEB-80-5, NUDOCS 8006300276
Download: ML19318B908 (4)

Text

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gogulpusuc senvice Companyof New Hampshire SEABROOK STATION Engineering Office:

20 Turnpike Road Westborough, MA 01581 SBN-122 Ref SBU-36102 T.F. B 4.2.5 U.S. Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Office of Inspection and Enforcement

Reference:

1. Docket No. 50-443 and 50-444

2. NRC letter dated March 10, 1980

3. IE Bulletin No. 80-05

Subject:

Vacuum Condition Resulting in Damage to Chemical Volume Control System (CVCS) Hold Up Tank

Dear Sir:

We have reviewed the design of all systems that contain low pressure or l hold up tanks that can be valved to contain primary system water. Attachment A )

provides a listing of tanks and describes measures that already exist for pro- ,

tection against vacuum conditions. l l

All tanks except two will either not experience a vacuum condition or can l withstand full vacuum conditions. The two exceptions found in this review were '

the Fasin Sluice Tanks and. the Primary Drain Tank. In both cases, mis-management of valve line-ups by operating personnel or unobserved equipment malfunction, could create a vacuum condition in the tanks.

For protection of the Resin Sluice Tank, a vacuum braker has been added to the system. A pressure regulating valve has been added and two valves have des-ignated locked open on the cover gas supply line to provide protection for the Primary Drain Tank.

1 1

If you require further information, please do not hesitate to contact us.

V ry truly ours, John DeVincentis HEW: tan Project Manager Attachment c.c : Director NRC Office of Inspection &

Enforcement, Washington, D.C. 20555 8 0 0 6 30 o '),7s

e NeM ATTACHMENT A Tank Vacuum Review System: Auxiliary Steam and Condensate P&ID: 804984 & 805032 Tank ASC-TK-ll6, Condensate Tank. Note 1 ASC-TK-ll7, Condensate Tank. Note 1 System: Reactor Coolant P&ID: 805007 Tank RC-TK-ll, Pressurizer Relief Tank. Note 1 (W Dwg. has 15 PSI Ext. Press, as design condition)

System: Safety Injection P&ID: 805009, 805010 Tanks SI-TK-94, B, C, & D, Accumulator Tank, Note 1 SI-TK-6, Boron Injection Tank, Note 1 SI-TK-7, Boron Injection Surge Tank, Note 2 System: Chemical & Volume Control P&ID: 805011, 12, 13, 14, & 37 Tanks CS-DM-1, 2A & 2B, Let-down Demineralizer. Note 1 CS-TK-1, Chemical & Volume Control Tank. Note 1 (W Dwg. shows 15 PSIG Ext. Press as design requirement) ,

CS-TK-2, Chemical Mis Tank. Note 1 (This is a length of'8" Sch. 40 Pipe).

CS-DM-3A, B, C, D & E, Baron Thernal Regeneration Demineralizers. Note 1 CS-TK-3, Chiller Surge Tank. Note 3.

CS-TK-5, Boric Acid Batching Tank. Note 8.

I CS-TK-4A & B, Boric Acid Tank. Note 3 CS-TK-64, Degasifier Hotwell & Column. Note 1 System: Primary Component Cooling Water P&ID: 805016, 805018 Tank CC-TK-19A & B, PCCW Head Tank. Note S.

System: Cpent Fuel Pool Cooling & Clean-up P&ID: 805017 Tank SF-DM-8, Fuel Pool Demineralizer. Note 1 System: Reactor Make-up Water P&ID: 805021 Tank RMW-TK-12, RMW Storage Tank. Note 3.

System: Containment Spray P&ID: 805023 Tank CBS-TK-8, Refueling Water Storage Tank. Note 3 CBS-TK-13, Spray Additive Tank. Note 3

. t-9 System: Steam Generator Blowdown 2 P&ID: 805024, 805035, 805039, 805037 Tank SB-TK-40, Blowdown Flash Tank. Note 1 SB-EV-5A, B, C, Demineralizer. These demineralizers are part of a skid which has not yet been designed. The require-ment for withstanding full vacuum will be investigated.

SB-TK-ll2A, B, & C. Note 1.

System: Equipment & Floor Drain P&ID: 80504 , 805632 Tank WLD-TK-55, Reactor Coolant Drain Tank. Note 1.

WLD-TK-86, Chemical Drain Treatment Tank. Note 3.

WLD-TK-87A, B, Chemical Drain Treatment Tank. Note 4.

System: Radioactive Gas Waste System P&ID: 805611, 12 Tank WG-D-3A, B, C, Gas Dryer Vessel. Note 1 WG-MM-26A, B, C, D & E, Carbon Delay Bed Vessel. Note 1 WG-TK-65, Hydrogen Surge Tank. Note 1 WG-TK-124, Drain Pot. Note 1.

System: Spent Resin Sluice P&ID: 805613 Tank RS-TK-79A & B, Resim Sluice Tank. Note 6.

System: Boron Recovery P&ID: 805614, 15, 16, 24, 26 Tank BRS-TK-56A & B, Boron Waste Storage Tank. Note 4.

BRS-DM-13A & B, Cesium Removal Ion Exchanger. Note 1.

BRS-EV-3A, B, Evaporator. Note 1.

BRS-EV-54A, B, Evaporator. Note 1.

BRS-TK-67, Degasifier Hotwell/ Column. Note 1.

BRS-TK-58A & B, Recover Test Tank. Note 3.

BRS-TK-14A & B, Recovery Demineralizer. Note 1.

BRS-TK-57A & B, Recovery Evaporator Accumulator. Note 1.

BRS-TK-66A & B,' Primary Drain Tank. Note 7.

System: Liquid Waste P&ID: 805619, 20 & 21 Tank WI-TK-59A & B, Floor Drain Tank, Note 4.

WL-EV-4, Evaporator. Note l.

WL-E-58, Evaporator Reboiler. Note 1.

WL-TK-63A & B, Waste Test Tank. Note 4.

WL-DM-15, Waste Demineralizer. Note 1.

WL-TK-61, Waste Evaporator Accumulator. Note 1.

. Lo System: Equipment Vent P&ID: 805622, 35, & 36 Tank VG-TIC-77, Separator Silencer. Note 9.

VG-TK-108, Safety Valve Surge Tank. Note 9.

System: Waste Solidification P&ID: 805631 Tank WS-TK-76, Waste Concentrates Tank. Note 4.

WS-TK-81, Radwaste Hopper. Note 3.

System: Condensate & Demineralized Water I

P&ID: 202077, 97 Tank CO-TIC-25, Condensate Water Storage. Note 3.

DM-TK-109, Demineralized Water Storage. Note 3.

Tank Vacuum Study Notes

1. Tank is designed to (or can) accept full internal vacuum.

2. Vented to atmosphere through overflow line with water seal.

3. Tank vented to atmosphere. Vent size criteria: The vent pipe shall be large enough to accept max. draw-down from pump shearing off largest outlet nozzle (with tank full) while preventing the build-up of an internal vacuum which could damage or endanger the tank water-tight integrity.

4. Tank vented to equipment vent system without an isolation valve.

5. Tank vented to plant exhaust plenum.

6. Tank maintained at 1-3 PSIG pressure with'N 1 ading.

2

7. Tank floats on H2 vent header with isolation valve.

8. Tank has a large diameter fill opening which is closed with loose fitting dust cover.

9. No vacuum can be formed in the equipment vent system.