ML19347C832
| ML19347C832 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 09/10/1975 |
| From: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| AO-19-75, NUDOCS 8103090791 | |
| Download: ML19347C832 (1) | |
Text
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4 NRC BHDA CONSUMERS POWER COMPANY PARNALL ROAD OFFICE J\\
NRC BHDA CONSUMERS POWER COMPANY PARNALL ROAD OFFICE JACKSON, MI TWX 517-787-1987 9-10-75 70- MR J G KEPPLER
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USNRC 799 ROOSEVELT ROAD GLEN ELLYN, ILL 60137 RE-DOCKET 50-155, LICENSE DPR-6 THIS TWX IS SUBMITTED TO CONFIRM THE TELEPHONE REPORT OF D E DE MOOR ON SEPTEMBER 8, 1975 REGARDING AN EVENT CLASSIFIED AS A0-19-75.
1.
REPORT NO
.AO-19-15 DOCKET-50-155 2A. REPORT DATE - S,EPTEMBER 9, 1975
- 28. OCCURRENCE DATE - 1962 1975 3.
FACILITY - BIG ROCK POINT PLANT 4.
IDENTIFICATION OF OCCURRENCE - REACTOR CLEANUP SYSTEM VALVES DESIGN DEF IC IENC Y.
5 CONDITIONS PRIOR TO OCCURRENCE - POWER OPERATION.
6.
DESCRIPTION OF OCCURRENCE - REVIEW OF VALVE APPLICATION DATA' FOR VALVES CV/4091, CV/4092, CV/4093 AND THE MANUAL ISOLATING VALVES IN SERIES WITH CV/4092 AND CV/4093 REVEALED THAT THESE VALVES HAVE ONE OF TWO DEFICIENCIES DEPENDING ON THE SEAT AND SEAL MATERIALS.
IF ThE VALVES CONTAIN NYLON-NEOPRENE SEATS AND SEALS THEY ARE 1
RATED AT ONLY 180 DEGREES F. SINCE THESE VALVES ARE CONTAINMENT ISOLATION VALVES THEY SHOULD BE RATED TO AT LEAST 235 DEGREES F.
2.
IF THE VALVES CONTAIN TEFLON SEATS AND SEALS, THEY ARE RATED AT ONLY 1000 PSI BY THE MANUFACTURER AND THUS WOULD BE SIGNIFI-CANTLY BELOW PRIMARY SYSTEM PRESSURE DESIGN REQUIREMENTS OF 1700 PSIA.
7.
DESIGNATION OF AP)HARENT CAUSE OF OCCURRENCE - ORIGINAL PLANT DES IGN 9630769ff'""'
~
WV IN JACKSONe MI, SENDING A TWX I
WILL PATCH WILL START AGAIN WITH PARAGRAPH 8 EWE WERE CUT O AND NOPE THAT YOU 8.
CLOSED AND THERE ARE NOANALYSIS OF OCCURRENCE - AT THE P CV/4093 OR THE TWO MANUALINDICATIONS OF EXTERNAL LEAHAGE ON CV/4092, ISOLATION VALVES ASSICIATED WITH THEM.
- ADDITION, HAVE ALSO BEEN CLOSED.THE MANUAL ISOLATION VALVES LO IN THE VALVE BODY AND FLANGE PRESSURE RATINGS ARE BELIEVED TO BE CONSIDERABLY HIGHER AND PLA ON THESE VALVES SINCE THEY WERE REPLACED ANY LEAKAGE PRO 9LEMS.
IN 1974 DOES NOT INDICATE 9.
CORRECTIVE ACTION - AT THE PRESENT TIME WE ARE RE DESIGN DATA, PROCUREMENT AND A FIX AND/OR OPERATIONAL CHANGES. INSTALLATION / REPAIR RECORD
- 10. FAILURE DATA - VALVES ARE WORCESTER, MODEL 4667, BALL VALVES OR MODEL 446 YN / NYLON SEAT, NEOPRENE SEAL / l-l/
/ TEFLON / l-1/2"
- VALVES, OR A COMBINATION OF THESE TWO TYPES.
R B SEWELL NUCLEAR LICENSING ADMINISTRATOR END - DW CC-DIVISION OF REACTOR LICENSING USNRC C J HARTMAN, BIG ROCK POINT PLANT NRC BHDA
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