ML19270F917
| ML19270F917 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 03/21/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7904030051 | |
| Download: ML19270F917 (1) | |
Text
1 n n.
e,d o "4
UNITED STATES
, 1, NUCLEAn REGULATORY COW.11SSIO N f4 q,1 O, ' h.
~
$UlIE 207 W ALNUT C RELK PL AZ A g
1990 N. C AL.lF O R NI A IiOUL E V A H D
- e*
W ALNU T C REEK, C Allr OR NI A 94596 IW 21 ?f/S Docket No. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacra.Tento, California 958]3 Attention:
Mr. John J. Mattimoe Assistant General Manager Gentlemen:
The enclosed IE Information Notice No. 79-05 is forwarded to you for information.
No specific action is requested and no written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
/ 7bvdN j
R. H. Engelken Director
Enclosures:
1.
IE Information Notice No. 79-05 2.
List of IE Ir..arcation Notices Issued in 1979 cc w/ encl:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 790403 DON
UNITED STATES NUCLEM REGULATORY COMMISSION 0FFICE Or INSPECTION AND ENFORCE"E'4T WASHII;GTON, D.C.
20555 March 21, 1979 IE Inforration Notice No. 79-05 USE OF IMPROPER MATERIALS IN SAFETY-RELATED COMDONE'1TS Two instances of the addition of improper materials to safety-related components during maintenance have recently been identified by NRC inspections.
Materials on Valve Seating surfaces An NRC inspector found that maintenance personnel at the Surry nucle:r power plant had added wax or grease to certain valve seating surfaces.
These valves included the containment spray and recirculation spray isolation valves.
This material could have affected the measured leak rate through these ccntainment penetrations. VEPC0 personnel said that the raterial was believed to have been added to prevent damage to the valve seating surfcces during dry valve testing.
It had not been renoved folicwing completion of the maintenance procedure.
VEPCO personnel also reported that a lack of any definitive administrative cuidance as to what lubricants, if any, could be used during valve maintenance, contributed to this orcblem.
The corrective action included modifica-tion of the procedures to include nore precise inspection by quality control personnel following valve naintenance.
Grease in Snubbers An NRC inspector found that maintenance personnel at the Browns Ferry nuclear power plant had added grease to the hydraulic fluid reservoirs of eight Bergen-Paterson snubbers. The grease had nistakenly been added, during a scheduled lubrication procedure, through the alemite type fittings used for normal fluid addition. A similar error invciving thirteen snubbers had previously been made at this facility. At that time the decision had been made to install a different type of fitting on the snubbers.
However, the replacement parts had not arrived in tine for installation prior to the more recent lubrication. At the time of the earlier occurrence, TVA personnel had removed the affected snubbers and tested them for lock-up and bleed rate. The results had been within specification.
Nevertheless, the units had been disassembled and cleaned prior to reinstallation.
NRC inspectors witnessed the disassenbly of one of the later set of creased snubbers (a four-inch unit). Approxinately one cubic inch of grease was found in the reservoir. Although the grease Page 1 of 2 h
7903300180
IE Information fictice fio. 79-05
'4 r - :...N s
Grease in Saubbers (continued) had been in the reservoir for only four days, and str li ; :'
+
snubbers was limited to that which occurred during its re :._'
grease was found in the control valve assembly and tFe sr ::
cyl inder. All of the recently greased snubbers were rerlict:
spare units.
These two occurrences illustrate the necessity of conte:lli--
construction and maintenance practices through the use :' ci e -
fully developed procedures desiqned to prevent errors, sE :: :e intraduction of foreign materials into safety-related c: :: e-t-This information is provided as a notification of a 0:sd 1: - --i'icant matter.
It is expected that recipients will review the in'- ~7:':n for possible applicability to their facilities, fio speci#i: at ' - :c response is requested at this tire.
If further flRC evaluations s: i :":i e, an IE Circular or Bulletin will be issued to recommend or rec.est ::e:"ic li-censee actions.
If you have qut:tions regarding this itte. :' esse contact the Cirector of the appropriate ?!RC Regional ^## ice.
Enclosure:
Listing of IE Information flotices Issued in 1979 Page 2 of 2
IE Infonnation N tice No. 79-05 I
March 21, 1979 LISTING OF IE INFORMATION NOTICES ISSUED IN 1979 Information Subject Date Issued To Issued l
Hotice No.
79-01 Bergen-Paterson Hydraulic 2/2/79 All cower reactor Shock and Sway Arrestor facilities with an OL or a CP 79-02 Attenpted Extortion -
2/2/79 All Fuel Facilities low Enriched Uranium 79-03 Limitorque Valve Geared 2/9/79 All power reactor Limit Switch Lubricant facilities with an OL or a CP 79-04 Degradation of 2/16/79 All power reacter Engineered facilities with an Safety Features OL or a CP 79-05 Use of Inproper Materials 3/21/79 All power reactor in Safety-Related facilities with an OL cr CP Components Enclosure Pace 1 of I