ML20236C798

Part 21 Rept Re Defect Concerning Modulating Solenoid Valve Supplied by Target Rock Corp.Valve Has Been Reassembled Using Proper Spiral Pin

ML20236C798
Person / Time
Site:	Beaver Valley
Issue date:	10/22/1987
From:	Garfinkel P STONE & WEBSTER ENGINEERING CORP.
To:	Berlinger C Office of Nuclear Reactor Regulation
References
REF-PT21-87-188-000 PT21-87-188, PT21-87-188-000, NUDOCS 8710270336
Download: ML20236C798 (3)

Text

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o STONE 6 WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET. BOSTON. M ASS ACH U SETTS ADDRESS ALL CORRESPONDENCE TO P.O. BOX 2325. BOSTON M A 02107 -#

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Mr. Carl Berlinger October 22, 1987(n '

Generic Communications Branch. 9

, Office of Nuclear Reactor Regulation ui

, n U.S. Nuclear Regulatory Commission #

Washington, DC 20555 NOTIFICATION OF DEFECT BEAVER VALLEY POWER STATION - UNIT 2 DUQUESNE LIGHT COMPANY Stone & Webster Engineering Corporation (SWEC), pursuant to the provisions of 10CFR21, hereby provides notification of a " defect" concerning the Beaver Valley Power Station - Unit 2, owned in part by Duquesne Light Company (DLC), and for which SWEC provided both engineering and construction services.

In accordance with the reporting requirements of Section 21.21(b)(3), the following information is submitted:

1. Name and address of the individual informing the Commission:

Mr. P. Garfinkel Director of Engineering l Stone & Webster Engineering Corporation l P.O. Box 2325 Boston, MA 02107 ii. Identification of the facility, or the basic component supplied for such facility, which contains a defect: l l

Beaver Valley Power Station - Unit 2 '

Modulating solenoid valve lii. Identification of the firm constructing the facility or supplying the basic component which contains a defect:

l Basic component supplied by Target Rock Corporation ,

l iv. Nature of the defect and the safety hazard which could be created:

During the course of disassembling Target Rock modulating solenoid valve 2SWS*TCV101B, a wooden dowel pin was found ic place of the required stainless steel spiral pin. The spiral b

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A CB 2 pin is used' to' prevent _ rotation of the disc rod which is threaded into the plunger. Rotation of the disc rod could result in an increase or decrease to valve stroke causing excessive leakage. or reduced opening. Valve 2SWS*TCV101B is-used to maintain condenser inlet water temperature between 72 F i and 86*F to maintain compressor head pressure within . design  !

limits.

Malfunction of the valve would result _in a trip of the refrigeration unit which, in turn, would ' result in a loss of cooling for the Control . Room area until such time as the redundant unit is operating. Loss of the ' refrigeration unit during a LOCA, coincident with a single failure of the redundant i train, could cause the equipment environmental qualification temperature of 104 F to be exceeded in 12.5 ninutes.

Additionally,.there would not be enough time for the operator to i open the' bypass valve in a time frame consistent with the <

guidance set forth in ANSI /ANS 58.8-1984. This represents a l major reduction in the degree of protection provided to the l public health and safety and could create a substantial safety hazard.

v. Date on which information of such defect was obtained:

.0ctober 22 1987 vi. In the case of a basic component which contains a defect, the number and location- of all such components in use at, supplied for or being supplied for facilities subject to the regulation: ,

Beaver Valley Unit 2 is, to date, the only project for which SWEC has or had applicable engineering, design or procurement responsibility determined to have this defect. Should this

.information change, this report will be amended accordingly.

vii. Corrective action which has been taken; name of individual or organization responsible; and length of time taken to complete the action:

The valve was reassembled using the proper spiral pin. A duplicate valve, manufactured at the same time as the deficient valve and assembled by the same technician, was inspected and i no improper parts were found, viii. Advice related to the defect that has been given to purchasers or licensees:

No other action apart from that specified above. Correspondence j with the vendor indicated that this was the only case reported in over 5,000 solenoid valves which had been shipped since 1972.

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i CB 3 If you require any further information, please contact Mr. R. B. Bradbury at (617) 589-1291.

v P. Garfir el Director of Engineering JBS:lNL -

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