ML20050C628

Updated LER 81-033/03L-1:on 810928,RCS Leak in Excess of 1 Gpm Traced to Isolation Valve 2-RC-403.Caused by Leaking Seal Ring Between Body & Bonnet.Seal Ring Replaced

ML20050C628
Person / Time
Site:	Millstone
Issue date:	04/02/1982
From:	Bergin J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20050C624	List: ML20050C623 ML20050C628
References
LER-81-033-03L, LER-81-33-3L, NUDOCS 8204090183
Download: ML20050C628 (1)

Text

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A LICENSEE EVENT REPORT UPfTEREPORT-PREVIOUSREPORT U DA v 10-27-81 CONTHOL RLOCK: (())

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7 8 b0 61 uvCKt:INUMBER

r. VENT DESCnlPTIO'J AND PROD ABLE CONSEQUENCES h i

[FITl I During steady state power operation, a leak of unknown origin in the Reactor Coolant The leak was. traced to l

, [o]g i ystem S in excess of 1 GPM was identified in containment.

j l lip] l Isolation Valve 2-RC-403 which is the block valve for power operated pressure ' relief

[rgTj [. valve 2-RC-402. 2-RC-403 was isolated and the leakage reduced to less than 1 GPM, in 2-RC-402 we declared inoperable l i [TE] [ compliance with Technical Specification 3.4.6.2.b. ,

The block valve 2-RC-403 wa, repair j pJi] l_in accordance to Technical Specification 3.4.3.a.

Similar incidents LER 79-15. j lgg l ed during the 1981 refuel . H0 r E t DE SUB E C0WGNLNT CODE 'B dE SL ODE lTy] (_ ClB l@ [Ej@ l B l@ l Vl Al L l V l E l X ]6 [_EJ@ 18 19 lD_j 20 9 10 ft 12 93 7 8 PEPOHT HEViSION SEGUL Nil AL OCCUR R E NCE CODE TYPE N O.

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33 34 35 36 CAU5E DELCHlPTION AND CORHF'CTIVE ACTIONS h l

g l The valve 2-RC-403 is a 25 ir.ch pressure seal gate valve with a motor operator, rated i

g l at 2500 PSI, ASME III, Class I, SA-182, stainless steel. The leak in 2-RC-403 was The valve was then l g g repaired by replacing the seal ring between the body and bonnet.

The power operated relief valve 2-RC-402 was then declared l j gl put back into service.

l , , g operable. 80

. 7 8 9 OT HE R S T A TUS DI CO RY DISCOVEHY DESCHIPTION

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tOSeph M. Bergin 2, N A*.it OF PHL PAHE R

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