ML19345C839
| ML19345C839 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/10/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 8012080474 | |
| Download: ML19345C839 (1) | |
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UNITED STATES
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$31 PARK AVENUE mano oP Pnuss:A, PENNSYLVANIA 19400 November 10, 1980' Docket Nos. 50-245 50-336-50-423 Y-
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Northeast Nuclear Energy Company
(;d ATTN:
Mr. W. G. Counsil
.y Senior Vice President - Nuclear M
Engineering and Operations G
P. O. Box 270 Hartford, Connecticut 06101 i
Gentlemen:
The enclosed IE Information Notice No. 80-41, " Failure of Swing Check Valve in' the Decay Heat Removal System at Davis-Besse Unit No.
1," is forwarded to you for information. No written response is required.
If you desire addit.f onal information regarding this matter, please contact this office.
+
Sincarely, Boyce H. Grier Director
Enclosures:
1.
IE Information Notice No. 80-41 2.
List of Recantly Issued IE Information Noticas CONTACT:
E. G. Greenman (215-337-5267) cc w/encis:
J. F. Opeka, System Superintendent Nuclear Operations E. J. Mroczka, Station Superintendent D. G. Diedrick, :4anager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer K. W. Gray, Supervisor of Construction Quality Assurance H. R. Nims, Director of Nuclear Projects 8012080 '/7[
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I SSINS No.:
6835 Accession No.:
8008220260 UNITED STATES IN 80-41 NUCLEAR REGULATORY COP 91ISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
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November 10, 1980 IE Information Notice No. 80-41:
FAILURE OF SWING CHECK VALVE IN THE DECAY HEAT REMOVAL SYSTEM AT DAVIS-BESSE UNIT NO. 1 Description 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 leakage 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 arm to the valve body were missing 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 ~4as in progress when the failure was identified was being con-ducted in response to a letter frme 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 carly notification of a possibly significant satter that is still under review by the NRC sts' It is expected that recipients will review the information for possible r
...y ility to their facilities.
No specific action or response is ree med ai his time.
If NRC evaluations so indicate, further ifcensee actioc, qr be re: ested or required.
No written response to this IE Information Notice is requits
,. you have any questions regarding this satter, please contact the Director of the appropriate NRC Regional Office.
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1 IE Information Notice No. 80-41 November 10, 1980 i
RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued to Notice No.
Issued 80-40 Excessive Nitrogen 11/6/80 All holders of Supply Pressure a power reactor OL Activates Safety-Relief or CP Valve Operation to Cause Reactor Depressurization 80-38 Cracking in Charging 10/30/80 All holders of l
Pump Casing Cladding a PWR power reactor OL or CP 80-37 Containment Cool'er 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 r$ actor Bolting OL or CP o
80-35 Leaking and Dislodged 10/10/80 All holders of a Iodine-125 Implant Category G or G1 Seeds Medical License 80 Boron 011ution of 9/25/80 All holders of a Reactor Coolant During PWR Power Reactor OL Steen Generator Decontamination 80-33 Determination of 9/15/80 All holders of Teletherapy Timer a teletherapy Accuracy license 80-32 Clarification of 9/12/80 All holders of Certain Requirements an NRC or Agreement for Exclusive-use State License Shipments of Radioactive Materials 80-31 Maloperation of Gould-8/27/80 All holders of Brown Boveri 480V-Type a power reactor K-6005 and K-Don 6005 OL or CP Circuit Breakers I
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