ML20008E388
| ML20008E388 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/26/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Papay L SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 8010270504 | |
| Download: ML20008E388 (1) | |
Text
'o,,
UNITED STATES
,8 NUCLEAR REGULATORY COMMISSION h
E REGION V O
1990 N. CALIFORNIA BOULEVARD
,o GUITE 202, WALNUT CREEK PLAZA
- ,,,5 WALNUT CR EEK, CALIFORNIA 94596 September 26, 1930 Docket ilo. 50-206 Southarn California Edison Company P. O. Box 800 2244 Walnut Grove Avenue Rosemead, California 91770 Attention:
Dr. L. T. Papay, Vice President advanced Engineering Gentlemen:
This Information riotice is provided as an early notification of a possibly significant matter.
It is expected tnat recipients J1 review the information for possible applicability to their facilities, ilo specific action or response is requested at this time.
If further iiRC evaluations so indicace, an IE Circular or dulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding enis uatter, please contact the Director of the appropriate ilRC Regional Office.
Sincerely,
$meL$A R. H. Engelken Director
Enclosures:
1.
IE Information ilotice ilo. 30-34 2.
Recently issued IE Information ilotices cc w/enclesures:
J.11. Curran, SCE R. Dieten, SCE 8010270504 h
SSIflS No.: 6835 Accession No.:
8008220239 IEIN 80-34 UtlITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT UASHIflGTON, D.C.
20555 September 26, 1980 IE Information Notice No. 80-34: BORON DILUTI0fl 0F REACTOR COOLANT DURING STEAM GENERATOR DECONTAMINATION Description of Circumstances:
Recently two instances of boron dilution of the reactor coolant system have occurred. Both cases were a result of high pressure washing of the steam generator tube sheets for decontamination to reduce the radiation levels during eddy current testing and related steam generator work.
On May 29, 1980, Trojan Nuclear Plant miscalculated the excess boric acid required to offset the domineralized water used in washing the tube sheets.
This resulted in the boron concentration of the primary coolant being reduced to less than the minimum required by the Technical Specifications.
The dilu-tion was, however, expected since the wash water was allowed to enter the reactor vessel through the nozzles.
On July 5,1980, San Onofre Unit 1 inadvertently diluted the reactor coolant boron ccr.cer'
,when the high pressure nineralized flushing water leaked by a dislod cle seal. The inflatab'.
Ils had been installed to prevent the non-bor m e water from entering the reas ar. The resulting boron concentra-tion was greater than required for shutdown margin, but the positive reactivity added was in excess of that allowed by the Technical Specifications.
This Information Notice is provided to identify potential problem areas involved with decontaminating specific areas of steam generators.
It is expected that recipents wi_ll review the potential hazards involved and consider increased monitoring of 1) inflatable seal performance, 2) vessel level, and 3) boron concentration.
Increasing the boron concentration of the primary system prior to performing any decontamination activities or using borated water for washing should also be considered.
It is expected that recipients will review this information for possible applicability to their facilities.
No specific action or response is requested at 'this time.
If you have any. questions regarding this matter, please contact the Director of the appropriate Regional Office.
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~IN 80-34 September 26, 1980 RECEllTLY ISSUED IE INFORMATI0tl fl0TICES Information Date of
' Notice No.
Subject Issue Issued to 80-33 Determination of Teletherapy 9/15/80 All teletherapy Timer Accuracy (G3) licensees 80-32 Clarification of certain 8/12/80 All NRC and agreement requirements for Exclu-state licensees sive-use shipments of radioactive materials 80-31 Maloperation of Gould-8/27/80 All light water reactor Brown Bover! Type 480 facilities holding OLs volt type K-600S and or cps K-DON 600S circuit breakers 80-30 Potential for unaccept-8/19/80 All boiling water reactor able interaction between facilities holding power the control rod drive scram reactor OLs or cps.
function and non-essential control air at certain GE BWR facilities d
80-29L Broken studs on Terry 8/7/80 All light water reactor turbine stese inlet facilities holding _
flange power reactor OLs or cps
- Supplement to. -flotification of 7/29/80 All holders of reactor 80-06 significant events at and near-term OL
. operating power reactor applicants facilities 80-28 Prompt reporting of 6/13/80 All applicants for and required -information -
holders of nuclear power to flRC reactor cps 80-27 Degradation of reactor
-6/11/80 All pressurized water coolant pump studs reactor facilities holding power reactor Ols or cps'
. 80 Evaluation of contractor 6/10/80 All Part 50 licensees QA programs
- Operating Licenses or Construction Permits 4
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