ML19305D491
| ML19305D491 | |
| Person / Time | |
|---|---|
| Issue date: | 04/01/1980 |
| From: | Carroll D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wright G ILLINOIS, STATE OF |
| References | |
| NUDOCS 8004150150 | |
| Download: ML19305D491 (2) | |
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'o UNITED GTATES 8
'o NUCLEAR REGULATORY COMMISSION U
... E REGION 111 799 ROOSEVELT ROAD 3
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GLEN ELLYN,ILLINolS 60137 APR1 1980 i
State of Illinois Department of Public Health ATTN:
Mr. Cary N. Wright, Chief Division of Nuclear Safety 535 West Jefferson Street Springfield, IL 62761 Gentlemen:
The enclosed IE Information Notice No. 80-12 titled " Instrument Failure C:usas Opening of PORV and Block Valve" was sent to the following licen-sees on March 31, 1980:
American Electric Power Service Corporation Indiana and Michigan Power Company D. C. Cook 1, 2 (50-315, 50-316)
Cincinnati Gas & Electric Company Zimmer (50-358)
Cleveland Electric Illuminating Company Perry 1, 2 (50-440, 50-441)
Commonwealth Edison Company Braidwood 1, 2 (50-456, 50-457)
Byron 1, 2 (50-454, 50-455)
Dresden 1, 2, 3 (50-10, 50-237, 50-249)
La Salle 1, 2 (50-373, 50-374)
Quad-Cities 1, 2 (50-254, 50-265)
Zion 1, 2 (50-295, 50-304) t l
Consumers Power Company Big Rock Point (50-155) l Midland 1, 2 (50-329, 50-330) l Palisades (50-255) l l
Dairyland Power Cooperative LACBWR (50-409)
Detroit Edison Company Fermi 2 (50-341)
Illinois Power Company Clinton 1, 2 (50-461, 50-462) 8004150
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State of Illinois Iowa Electric Light & Power Company Duane Arnold (50-331)
Northern Indiana Public Service Company Bailly (50-367)
Northern States Power Company Monticello (50-263)
Prairie Island 1, 2 (50-282, 50-306)
Public Service of Indiana Marble Hill 1, 2 (50-546, 50-547)
Toledo Edison Company Davis-Besse 1 (50-346)
Union Electric Company Callaway 1, 2 (50-483, 50-486)
Wisconsin Electric Power Company Point Beach 1, 2 (50-266, 50-301)
Wisconsin Public Service Corporation Kewaunee (50-305)
Sincerely, g4
/
rothy Carroll, Actin Chief Administr tive Branch
Enclosure:
IE Information Notice No. 80-12 cc w/ encl:
Mr. D. W. Kane, Sargent & Lundy Central Files Reproduction Unit NRC 20b Local PDR NSIC TIC l
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SSINS No.:
6870 Accession No.:
UNITED STATES 8002280654 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 i
March 31, 1980 IE Information Notice No.: 80-12 INSTRUMENT FAILURE CAUSES OPENING OF.PORV.AND BLOCK VALVE l
Description of Circumstances:
On August 13, 1979, during full, steady-state power operation at.the Connecticut Yankee Haddam Neck Plant, the pressurizer power operated relief valve (PORV) and its isolation (block) valve opened as a result of failure of a light source in the sigma bistable of the pressurizer pressure controller.
The failure of the light source was equivalent in control system response to an overpressure condition in the pressurizer.
By system design both PORV and block valves are closed during normal operation and therefore both valves are required to open in response to an overpressure condition.
The opening of the PORV and block valve allowed the pressurizer pressure to drop from its normal i
value of 2000 psig to 1950 psig before the PORV and block valves could be closed. The operator immediately overrode the open signal to the valves and s
closed the valves to stop depressurization.
The pressurizer pressure then immediately returned to normal.
The light source was subsequently replaced in the bistable and the pressure control system was returned to normal.
The licensee reported that failures of light sources in the bistable of this pressure controller and in other similar plant bistables had been experienced previously.
Also, subsequently on February 4, 1980, a spurious signal from the pressure controller caused both PORV and block valve to open.
In both events, the operator responded immediately and effectively to limit the conse-quences of the event to a relatively mild pressure transient on the reactor coolant system.
The licensee also indicated that it had changed out the type of bistable with a solid state design which does not depend on a light source and which is expected to be more reliable.
This information is provided as notification of a possibly significant matter.
1 It is expected that receipients will review the information for possible applicability to their facilities. No specific action or response is requested at this time.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
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,o IE Information Notice No. 80-12 Enclosure March 31, 1980 PO RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued o Notice No.
Issued 80-11 General Problems with ASCO 3/14/80 All holders of Reactor i
Valves in Nuclear Application OL, CP, fuel fabrica-Including Fire Protection tion and processing Systems facilities t
80-10 Partial Loss of Non-Nuclear 3/7/80 All power reactor Instrument System Power facilities holding Supply During Operation OLs and cps t
80-09 Possible Occupational 3/7/80 All holders of Health Hazard Associated power reactor OLs I
with Closed Cooling Systems and near term cps 80-08 The States Company Sliding 3/7/80 All power reactog Link Electrical Terminal facilities with ah OL Block or a CP
'N 80-07 Pump Shaft Fatigue Cracking 2/29/80 All Light Water Reactor Facilities holder power reactor OLs and cps 80-06 Notification of Significant 2/27/80 All holders of Reactor Events OLs and to near term OL applicants j
80-05 Chloride Contamination 2/8/80 All licensees of nuclear of Safety Related Piping power reactor facilities and applicants and r
holders of nuclear power reactor cps 80-04 BWR Fuel Exposure in 2/4/80 All BWR's holding a Excess of Limits power reactor OL or CP i
80-03 Main Turbine Electro-1/31/80 All holders of power Hydraulic Control System reactor OLs and cps 80-02 8X8R Water Rod Lower 1/25/80 All BWR Facilities End Plug Wear holder power reactor OLs or cps 80-01 Fuel Handling Events 1/4/80 All holders of power reactor OLs and cps 79-37 Cracking in Low Pressure 12/28/79 All power reactor OLs Turbine Discs and cps j
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