ML17296B069
| ML17296B069 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/10/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 8012080638 | |
| Download: ML17296B069 (5) | |
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UNITEDSTATES NUCLEAR REGULATORY COMMISSION REGION V 1990 N. CALIFORNIABOULEVARD SUITE 202, WALNUTCREEK PLAZA WALNUTCREEK, CALIFORNIA94595 November 10, 1980 Docket Nos.
50-528, 50-529, 50-530 Arizona Public Service Company P.
0.
Box 21666
- Pnoenix, Arizona 85036 Attention:
Hr.
E.
E.
Van Brunt, Jr.
Vice President, Nuclear Projects Gentlemen:
Cll CD CDC=C
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fTl CA QQ Vl O
PO a
This Information ihotice is provided as an early notification of a possibly significant matter.
It is expected that recipients 'will review the information for possible applicability to their facilities.
i(o specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropr iate NRC Regional Office.
S'>cerely,
Enclosures:
l.
IE Information Notice No. 80-41 Recently issued IE Information Notices
- g el ken
]Dire or cc w/enclosures:
F. Ii. Hartley, APS
'80>20so ggIr
lt II
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 November 10, 1980 SSINS No.:
6835 Accession No.:
8008220260 IN 80-41 IE Information Notice No. 80-41:
FAILURE OF SWING CHECK VALVE IN THE DECAY HEAT REMOVAL SYSTEM AT DAVIS-BESSE UNIT
.NO.
1 Descri tion 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 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 Primar Coolant S stem Pressure Isolation Valves, February 23, 1980.
This IE Information Notice is provided as an early notification 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 applicability 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 written response to this IE Information Notice is required.
If you have any questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
RECENTLY ISSUED I E INFORMATION NOTICES IN 80-41 November 10, 1980 Information Notice No.
Subiect Date of Issue Issued to 80-40 Failure Of Swing Check 11/10/80 All power facilities Valve In The Decay Heat with and OL or CP Removal System At Davis-Besse Unit No.
1 80-39 Malfunctions Of Sol enoid 10/31/80 Valves Manufactured By Valcor Engineering Corporation All light water reactor facilities holding power reactor OLs or CPs 80-38 80-37 80-36 80-35 80-34 Cracking In Charging Pump Casing Cladding Containment cooler leaks and reactor cavity flooding at Indian Point Unit 2 Failure of Steam Generator Support Bolting Leaking and dislodged Iodine-124 implant seeds Boron dilution of reactor coolant during steam generator decontamination 10/30/80 10/24/80 10/10/80 10/10/80 9/26/80 All PlfR facilities with an OL or CP All nuclear 'power facilities holding power reactor OLs or CPs All nuclear power reactor facilities holding power reactor OLs or CPs All categories G and Gl medical licensees All pressurized water reactor facilities holding power reactor OLs 80-33 Determination of tel etherapy 9/15/80 timer accuracy All teletherapy (G3) licensees 80-32 80-31 Cl arificati on of certain requirements for Exclu-sive-use shipments of radioactive materials Maloperation of Gould-Brown Boveri Type 480 volt type K-600S and K-DON 600S circuit breakers 8/12/80 8/27/80 All NRC and agreement state licensees All light water reactor facilities holding OLs or CPs
~ Operating Licenses or Construction Permits
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