ML19345C841
| ML19345C841 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 11/10/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Morisi A BOSTON EDISON CO. |
| References | |
| NUDOCS 8012080477 | |
| Download: ML19345C841 (1) | |
Text
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o, UNITED STATES g
NUCf. EAR REGULATORY COMMISSION y
j REGION I c
631 PARK AVENUE 4,
g' KING oF PMUSSIA. PENNSYLVANIA 19406 Novencer 10, 1980 Docket No. 50-293
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Boston Edison Company M/C Nuclear NE ATTN:
Mr. A. V. Morisi E
Nuclear Operations Support Manager y
800 Boylston Street 4
Boston, Mr.ssachusetts 02199 i
Gentlemen:
The enclosed IE Information Notice No. 80-41, " Failure of Swing Check Valve in the Decay Heat Removal System at Davis-8 esse Unit No.1," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, m.f.
Sofce H. Grier -
Director
Enclosures:
1.
IE Information Notice No. 80-41 2.
List of Recently Issued IE Information Notices CONTACT:
E. G. Greenaan (215-337-5257) cc w/encis:
R. D. Machon, Nuclear Manager - Pilgrim Station 4
8012080 y77 h
L
.7 SSINS No.: 6835 Accession No.:
8006220260 UNITED STATES IN 80-41 NUCLEAR REGULATORY COPNISSION 4
0FFICE OF INSPECTION AND ENFORCENENT WASHINGTON, D.C.
20555 November 10, 1980 IE Information Notice No. 80-41:
FAILURE OF SWING CHECX VALVE IN THE DECAY HEAT REMOVAL SYSTEM AT DAVIS-BESSE UNIT NO. 1 Descriotion of Circumstances:
On October 9,1980 the resident inspector at the Davis-Besse facility was informed that the licensee had performed leak rate tests and identified exces-sive laakage through Decay Heat Removal System check valve CF-30.
Valve CF-30 is the inboard one of two in-series check valves that is used to isolate the reactor coolant system from the low pressure decay heat removal system.
On further investigation the licensee found that the valve disc and arm had separated from the valve body and was lodged just under the valve cover plate.
The two 2 5/8 x 5/8 inch bolts and locking mechanism for the bolts that holds the are to the valve body were missin.] and have not been located.
The CF-30 valve is a 14-inch swing check valve manufactured by Velan Valve Corporation.
The cause of the failure has not been identified.
The test that was-in progress when the: failure'was; identified was being con-ducted in response to a letter from Darrell G. Eisenhut, Office of Nuclear Reactor Regulations to all Light Water Reactor Licensees, LWR Primary Coolant System Pressure Isolation Valves, February 23, 1980.
This IE Information Notice is provided as an early nctification of a possibly significant matter that is still under review by the NRC staff.
It is expected that recipients will review the information for possible appifcability to their facilities.
No specific action or response is requested at this time.
If NRC evaluations so indicate, further licensee actions may be requested or required.
No writte i response to this IE Information Notice is required.
If you have any questions regarding this matter, please contact the Director of the appropriata NRC Regional Office.
l s
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IE Information Notice No. 80-41 Nove Acc 10, 1980 RECENTLY ISSUED IE INFORMATION NOTICES Information
' 'jtet Date Issued to Notice No, Issued 80-40
- essive Nitrogen 11/6/80 All holders of
>oly Pressure a power reactor OL
.fvates Safety-Relief or CP 21ve Operation to Cause Reactor Depressurization 80-38 Cracking in Charging 10/30/80 All holders of Pump Casing Cladding a PWR power reactor OL or CP 80-37 Containment Cooler 10/24/80 All holders of a Leaks and Reactor power reactor OL Cavity Flooding at or CP Indian Point Unit 2 80-36 Failure of Steam 10/10/80 All holders of a Generator Support power reactor Bolting OL dr CP 80-35 Leaking and Dislodged 10/10/80 All holders of a Iodine-125 Implant Category G or G1 Seeds Medical License 80-34 Baron Dilution of 9/26/80 All holders of a Reactor Coolant During PWR Power Reactor OL Steam Generator Decont.unination 80-33 Detemination of 9/15/80 All holders of Teletherapy Timer a teletherapy Accuracy license 80-32 Clarification of 9"2/80 All holders of Certain Requirements an NRC or Agreement for Exclusive-use State License
~
Shipments of Radioactive Materials 80-31 Ma1 operation of Gould-8/27/80 All holders of Brown Boveri 480V-Type a power reactor K-6005 and K-Oon 6005 OL or CP Circuit Breakers
.