ML20052F154
| ML20052F154 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/07/1982 |
| From: | Wild P STONE & WEBSTER ENGINEERING CORP. |
| To: | Deyoung R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-82-587-000 PT21-82-587, PT21-82-587-000, NUDOCS 8205120176 | |
| Download: ML20052F154 (3) | |
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STONE 8 WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET. BOSTON. M ASS ACHUSETTS ADDRESS ALL CORRESPONDENCE TO P.O. 804 2325. BOSTON. M A SS. 02107 W U TELEX 94 000' N vv omm c NntstuctioN
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tir. Rict.ard C. DeYoung Ma 7, 1982 Office of Inspection and Enforcement f
U.S. Nuclear Regulatory Commission O
Washington, DC 20555
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Dear fir. DeYoung:
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/L NOTIFICATION OF DEFECT, 10CFR21 t!AINE YANKEE AT0t!IC POWER PLANT 9
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r1AINE YANKEE AT0f1IC POWEP C0FIPANY f'Y
,f Stone & Webster Engineering Corporation (SWEC), pursuant t l's ions of 10CFR21, hereby provides notification of a " defect" concerning the ?!aine Yankee Atomic Power Plant, owned by the t!aine Yankee Atomic Power Company 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 individual informing the Commission:
Ft r. P. A. Wild Director of Engineering Stone & Webster Engineering Corporation P.O. Box 2325 Boston, ?!A 02107 2.
Identification of the facility, or the basic component supplied for such facility, which contains a defect:
t1aine Yankee Atomic Power Station Design of the Safety Injection Actuation System (SIAS) with respect to the actuation signal due to low pressurizer pressure.
3.
Identification of firm constructing facility or supplying basic component which contains a defect:
f il Basic component supplied by SWEC.
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O 8205120176 820507 PDR ADOCK 05000309 S
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4.
Nature of the defect and the safety hazard which could be created by such defect:
There exists a departure from the technical requirements of a procurement document in that the Safety Injection Actuation System could fail to operate as required.
The SIAS design is a basic component and has been delivered to a purchaser.
A single relay provides the SIAS actuation signal due to low pressurizer pressure. This relay is controlled by a 2 out of 4 logic composed of four independent pressurizer pressure signals. Failure of this relay or loss of power to this relay will prevent automatic actuation of safety injection for those accidents resulting in loss of reactor coolant system pressure but not high containment pressure.
Safety injection is necessary to mitigate the consequences of these accidents. Lack of automatic actuation of safety injection represents a major reduction in the degree of protection provided to the public health and safety and results in a substantial safety hazard.
5.
Date on which information of such defect was obtained:
May 7,1982 6.
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 regulations:
Supplied for Maine Yankee Atomic Power Plant only.
7.
Corrective action which has been taken; name of individual or organization responsible; and length of tit e taken to complete the action:
The design correction will be done by the licensee.
8.
Advice related to the defect that has been given to purchasers or j
licensees:
See Section 7.
We have been informed that the NRC is aware of this problem per telephone call between Nat Villalva (NRC) and R. B. Bradbury (SWEC) on February 1, 1982.
In addition, IE has issued PNO-1-82-13 on this subject.
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If you require any further information, please contact Mr. R. B. Bradbury at 617-973-0291.
Very truly yours, YO&M/
P. A. Wild Director of Engineering PAW:CM i
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