ML17275A802

Part 21 Rept Re Failure to Provide Proper Control Components Intl Valves Supplying 2 Gpm Flow When in Closed Position. Caused by Valve Failure.Affected Licensees Notified & Selection of Alternative Method Underway

ML17275A802
Person / Time
Site:	Columbia, Washington Public Power Supply System, Satsop, Trojan  File:Portland General Electric icon.png
Issue date:	01/09/1981
From:	Taylor J BABCOCK & WILCOX CO.
To:	Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-81-339-000 PT21-81-339, PT21-81-339-000, NUDOCS 8101230730
Download: ML17275A802 (4)

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l3abcock ccVlilt..ox tluclear Power Generation Oivision a Mcoermott company 3315 Old Forest Road P.O. Box 1260 Lynchburg. Virginia 24505 (804) 384 5111 January 9, 1981 r~ "-".tq 6>>> 0t;o Hr. Victor Stello, Director Qg~Qtg Office of Inspection and Enforcement Go- G>g United States Nuclear Regulatory Commission 4- GZ Washington, D. C. 20555

Dear Hr. Stello:

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Pursuant to the requirements of 10CFRgl this report, in three copies, is made concerning valves supplied by Control Components International (CCI),

Irvine, California, for use as makeup flow control valves on Washington Public Power Supply System (WPPSS) and Portland General Electric (PGE) contracts which will not supply 2 gpm flow when in the closed position as requirsd by B5W specification. The function of this valve is to supply cold (n120 F) borated or demineralized water as makeup to the reactor coolant system (RCS) through a nozzle in the cold leg. This nozzle is one of four that is also used to supply high pressure injection for emergency core cooling in a LOCA situation.

The concern is that, without this flow in the closed position, normal transient operation could cause thermal cycling that would exceed the stress limits of this nozzle over forty year plant life. Failure of this nozzle could result in a LOCA or in a LOCA situation result in a partial loss of high pressure i n jecti on capaci ty.

These valves are used in the Makeup and Purification systems for the NPPSS contract, two valves, one per plant, designated MU-V46; and for PGE contract, one valve, designated HU-Y46. They are not used for this application in any operating plant or other plant under construction.

The cause of this concern is the inability of the valve to supply the specified flow in the closed position. Corrective action consists of:

l. Notification of the affected licensees of this concern.

2. Initiation of a program to determine the best method to provide the required 2 gpm flow when the valve is closed. Both use of a different or revised valve design or provision of an external bypass line are being considered. Corrective action will be considered complete when the selected method to restore this specified 2 gpm flow is implemented on the affected contracts.

BBl3cocl( &Yi'ilcox ter. Victor Stello, NRC January 8, 1981 Hr. D. E. Guilbert, Vice President, Nuclear Power Generation Division of Babcock 5 l<i lcox Company was informed of this reportable concern on January 5, 1981.

This letter confirms our telephone conversation of January 6, 1981 on the subject with hir. H. R. Nills of your office.

V trul vours

. H. Tayl bianager, Licensing JHT:vp cc: R. B. Borsum D. E. Guilbert

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