ML20033A718
| ML20033A718 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Palo Verde |
| Issue date: | 09/28/1981 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Van Brunt E, Vanbrunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| Shared Package | |
| ML20033A710 | List: |
| References | |
| NUDOCS 8111270143 | |
| Download: ML20033A718 (1) | |
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September 28, 1981 Docket Nos. 50-528, 50-529, 50-530 Arizona Public Service Company P. O. Box 21666 Phoenix, Arizona 85036 Attention: Mr. E. E. Van Brunt, Jr.
Vice President, Nuclear Projects Gentlemen:
lhe enclosed infomation notice provides early notification of an event that may have safety significance.
It is expected that recipients will review the information notice for possible applicability to their facilities. No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE bulletin or circular will be issued to reconnend or request specific licensee actions.
If you have any questions regarding this matter, please contact this office.
Sincerely.
Ongine! s'gned by R. H. Engelken R. H. Engelken Director
Enclosures:
1.
IE Infomation Notice No. 81-30 2.
List of Recently issued IE Information dotices cc w/ enclosures:
F. W. Hartley, APS G. C. Andognini, Vice President, Electric Operations 8111270143 810928 PDR ADOCK 05000133 G
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j L INS No. 6835 Accession No.:
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-8107230027
- IN 81-30 s
UNITED STATED'- -
NUCLEAR ~ REGULATORY COMMISSION ~.-
0FFICE '0F-INSPECTION AND: ENFORCEMENT WASHINGTON, D-C. - 20555/ '
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c 1 September:28,71981' "i i
<v IE INFORMATION N0TICE N0.s 81-30: VELAN 4 SWING CHECKtVALVES.
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Description of Circumstances:
Recent occurrences with Velan swing check valves are described below.
1.
On June 30, 1981, Public Service Electric & Gas Company reported (LER 81-035/01T) that on June 6,1981, while a leak in the bonnet of a swing check valve in the steam supply to the turbine driven auxiliary feedwater pump at Salem Generating Station, Unit 2,' was:being repaired, the valve was found to be internally damaged.
The valve is a Velan 6-in. swing check valve (Type B14-2114 B-2TS).
The valve disk stud had broken and the valve disk was in the bottem of the valve body. The valve also had cracks in the disk, cracked bushings, a warped hinge pin, and all hinge pin holes were elongated.
The -licensee inspected the corresponding swing check-valve in the other steam supply line and discovered similar damage. An inspection of the corresponding swing check valves on Unit 1 also revealed similar damage (LER81-059/01T).
The licensee plans to radiologically examine the valves monthly until a reason for the damage can be determined.
2.
On July 31, 1981, Wisconsin Electric Power Company reported (LER 81-010/01T-0) that on July 14, 1981, while a check valve leakage test at the Point Beach Nuclear Plant, Unit 1, was being perfonned, the check valves closest to the reactor coolant system in the low head safety-injection lines were found to be leaking more than allowed by the leakage acceptance criteria.
The valves are Velan 6-in. 1500 psig ASA swing check valves (Velan Drawing No. 78704).
The valves were disassembled and the disks were found to be stuck in the full-open position due to interference between the disk nut lockwire (disk wire) and the valve body.
The disk nut and its shaf t can rotate freely, and, in certain random rotational positions, this interference is likely to occur.
The licensee has replaced the disk wire with a cotter pin that will not cause interference with the valve body for any rotational position.
Subsequent inspection of the other check valves in the low head safety injection lines Y.
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IN 81-30 September 28, 1981 Page 2 of 2 was performed.
These valves were found to be closed.
The lock wires were nevertheless replaced with cotter pins.
The drawing for the same valve used at the Prairie Island plant was also checked. The drawing (Velan Drawin the lock wire be tack welded down (g No. 78704) is annotated to require that' so.it cannot interfere with the valve body). Because this detail is not unifonn on the subject drawing and can vary from plant to plant, a verification and/or changeout on this locking device may be necessary..
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Additional occurrences NithiVelan swing check ~ valves-ar5 described in IE Bulletin 79-04, " Incorrect Weights' for. Swing Check Valves Manufactured by Velan Engineering Corporation," and.in IE Information Notice 80-41,1" Failure of Swing Check Valve in the Decay Heat Removal ' System at Davis-Besse Unit No.il."
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This information is provided as notification of a potentially significant matter.
It is expected that'. recipients.will. review, the'information for-possible applicability to their facilities.' 'No specific actio'n or ' response is requested at this' time.
If you have que'stions regarding this matter, please contact the Director of the appropriate NRC Regiorial,0ffice.
Attachment:
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Recently issued IE Information Notices N
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Attachment.
IN 81-30 September. 28, 1981 RECENTLY ISSUED IE INFORMATION NOTICES Information Date of Notice No.
Subject-Issue Issued to 81-29 Equipment Qualification 9/23/81 All power reactor Testing Experience facilities wit' an OL or CP:
81-28 Failure of Rockwell-Edward' 9/3/81
'All power reactor-Main Steam Isolation Valves-facilities with an OL.or'CP.
81-27
~ Flammable Gas Mixtures
- 9/3/81 All power reactor in _the Waste Gas. Decay facilities with an Tanks in PWR Plants OL or.-CPJ 81-26 Compilation of-Health 9/3/81
'. All power. reactor Physics Related Information
" facilities with an Items OL or CP~
o 81-25 Open Equalizing Valve 8/21/81.
All' power reactor of Differential' Pressure-
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facilities with an' Transmitter Causes Reactor OL'or CP icram and Loss of Redurdant' Safety Signals
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81-24 Auxiliary ~ Feed' Pump -
8/5/81 1 All power reactor.
Turbine Bearing Failures-facilities 'with an
. 0L or CP ~
81-23 Fuel Assembly Damaged 8/4/81 All power _ reactor due to Improper Positioning facilities with an of Handling Equipment OL or CP 81-22 Section 235 and 236 7/31/81 All power research Amendments to the reactor, fuel Atomic Energy Act fabrication and of 1954 reprocessing, and spent fuel storage licensees.and applicants-4 81-21 Potential Loss of Direct 7/21/81 All power reactor Access to Ultimate Heat Sink facilities with an OL or CP OL = Operating License CP =' Construction Permit k