ML19305C127
| ML19305C127 | |
| Person / Time | |
|---|---|
| Site: | 05000363 |
| Issue date: | 03/14/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| NUDOCS 8003260030 | |
| Download: ML19305C127 (1) | |
Text
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UNITED STATES
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g NUCLEAR REGULATORY COMMISSION 3
j REGION I O
g 631 PARK AVENUE
' *****,e KING OF PRUSSIA, PENNSYLVANIA 19408 March 14, 1980 Docket No. 50-363 Jersey Central Power and Light Company ATTN:
Mr. I. R. Finfrock, Jr.
Vice President 260 Cherry Hill Road Parsippany, New Jersey 07054 Gentlemen:
The enclosed IE Circular No. 80-04, " Securing of Threaded Locking Devices on Safety-Related Equipment," is forwarded to you for information.
No written response is required. If you desire additional information regarding this matter, please contact this office.
Sincerely, e
i _
~
W[
Boyce H. Grier J Director
Enclosures:
1.
IE Circular No. 80-04 2.
List of Recently Issued IE Circulars CONTACT:
L. E. Tripp (215-337-5232) cc w/encls:
M. K. Pastor, Project Manager 3003260 0 30
l l
i ENCLOSURE 1 SSINS NO. 6830 Accession No.:
UNITED STATES 7912190662 NUCLEAR REGULATORY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT l
WASHINGTON, D.C.
20555 IE Circular No. 80-04 Date:
March 14, 1980
]
Page 1 of 3 i
SECURING OF THREADED LOCKING DEVICES ON SAFETY-RELATED EQUIPMEN Description of Circumstances:
1 In recent months, several licensee event reports have been submitted that address the inoperability of safety-related equipment caused by loosened threaded locking devices.
Some of the events are listed below:
MAIN STEAM CHECK VALVE HEX NUT LOCKING DEVICES, TURKEY POINT NO. 3 1
I.
REPORTABLE OCCURRENCE 250-79-31 (Oct. 22, 1979)
During a planned outage of Turkey Point Unit No. 3 on October 7, 1979, a two-inch internal diameter hex nut was discovered in the internals of a Investigation steam supply valve for a moisture separator-reheater.
revealed that the nut was missing from the disc stud of the 3A main steam The disc and disc stud were in the proper position and the check valve.
The 3B and 3C main steam check valves were valve was fully operable.
inspected and the disc stud, nut and locking washer were in place although some distress was noted on the 3C locking washer in that the tack welds on the locking pin had separated.
j The licensee installed an improved locking device on the disc stud on each of the three main steam check valves.
The locking device consists of a tab washer that is prevented from' rotating by a pin and by fingers that extended on either side of the valve arm; the tabs are bent up against two faces of the hex nut. The main steam isolation valves (MSIV) have the same type of hex nut locking device.
The valves are Schutte and Koerting SK Type 828.
SLIPPAGE AND MISALIGNMENT OF VALVE LINKAGES, DAVIS-BESSE LICENSEE EVE II.
REPORT NOS78-101 (Nov. 1, 1978),78-126 (Jan. 26, 1979),79-068 (July 19, 1979), and 79-098 (Oct. 30, 1979) two service water s stem These reports involve the inop valves and one component cooli declared inoperable because th missing or had loosened to the DUPLICATE DOCUMENT i
ment of the valve linkage. Th
)
The supplier has provided the 1 Entire document previously manual that defines the torque entered into system under:
used to retain the actuator li C7 h
f No. of pages: