ML19345D573
| ML19345D573 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 11/24/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8012160097 | |
| Download: ML19345D573 (1) | |
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NUCLEAR RECULATORY CCMMISSION 4
L 3 e nEGION V
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I;ovember 24, 1980 Docket i:os. 50-133, 50-275, 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Atteation: Mr. Philio A. Crane, Jr.
Assistant General Counsel Gentlemen:
The enclosed Information Notice is provided as an early notification of a possibly significant matter.
Recipients of tnis notice should review tne information for possible appiicability to tneir facilities.
However, no specific acti a or resconse is requested at this time.
If further NRC evaluations so inaicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee ac ti c.is.
If you nave questions regaraing this matter, please contact this office.
Sincerely, hMw c Ib 3
R. H. Engelken Director
Enclosures:
1.
IE Information tiotice flo. 80-42 2.
Recently Issued IE Infornation flotices cc w/ enclosures:
J. D. Shiffer W. Raymond, PGLE R. C. Thornberry, Plant Manager E. Weeks, PG&E, Humboldt Bay E. D. Langley, Jr., PG&E 8 01216coff
I SSINS No.: 6835 Accession No.:
UNITED STATES 8008220261 HUCLEAR REGULATORY CCMMISSION IN 80-42
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0FFICE OF INSPECTION AND ENFORCEMENT L'ASHIt'GTON,0.C.
20555 November 24, 1980 IE Information Notice "o. 80 42:
EFFECT OF RADIATION ON HYDRAULIC SNUBBER FLUID Descriotion of Circumstances:
On August 7,1980, Florida Power Corporation (FPC) filed a report in accordance with 10 CFR Part 21 that identified an upper service limit of 10 Mrad (megarad) of radiation on the General Electric Versilube F-50 fluid that was provided in Anker-Holth shock suporessors mounted on the reactor coolant pumps.
This upper limit was obtaineri frcm the results of a study performed for FFC by Rensselaer Polytecnnic Institute (RPI). These results contained two items of prime importance to the operation of the suppressors.
The first result was a significant increase of the viscosity of the fluid to the extent j
that incipient gelation of the fluid occurred at exposures of approximately 50 Mrad. The viscosity increased linearly for exposures up to 20 Mrad and then increased exponentially for exposures greater than 20 Mrad. The second ree"It shcwed that hydrccnioric acid (hcl) was fomed in significant j
qu.atities when the fluid was subjected to radiation.
The following table lists the dose irradiation time and hcl formed.
Dose Irradiation hcl Formed (Mrad)
Time (ppm) 0 2.78 1.2 1 minute 70.3 5.8 5 minutes 329.
l 5.8 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> 335.
18.5 11.2 minutes 555 50.3 15.2 ninutes 1592 One of the reccmrcadations by the RPI personnel was that tha fluid be replaced before a limit of approximately 6 Mrads was reached.
FPC reported that the fluid in service at Crystal River No. 3 plant had absorced doses ranging from 2.3 to 3.6 Mrads,these values were determined by comparing the viscosity of the fluid in service to that of the test samples at RPI. The Technical l
Instruction Manual that is provided by the vendor for these suppressors contains a recommendation that 12.5 Mrads should be the maximum service life for Versilute F-50.
This IE Information Motice is provided as an early notification of a possibly significant matter that is still under review by the NRC staff.
Recipients should review the information for possible applicability to their facilities.
No specific action er response is requested at this time.
If NRC evaluations so indicate, further licensee actions may be requested or required.
Ifl 80-42 flovember 24, 1980 Page 2 of 2 i:o written respense to this IE Information l'otice is renuired.
If you have any questions regarding this matter, please contact the Director of the appropriate flRC Regional Office.
l l
Ill 80-42 flovember 24, 1980 PECEllTLY ISSUED IE It! FORT'ATIG!' !!0TICES Information cate or flotice f:o.
Subject Issue Issued to 80-41 Failure of Swing Check 11/10/80 All power reactor "alve in the Decay Heat facilities with an OL Peroval Systen at Davis-or CP Besse Unit No. 1 80-40 Failure Of Swing Check 11/10/80 All power facilities "aive In The Decav Peat with ar.d OL or CP Peroval Systen At Davis-Besse Unit No. 1 80-39 i'alfunctions Of Solenoid 10/33/30 All light water reactor "alves Manufactureo By facilities holding
'!alcor Engineering Corporation rower reactor OLs or cps 80-38 Crackino In Charging Pump 10/30/80 All PHR facilities Casiro Cladcing with an OL or CP 80-37 Centainrent cooier leaks 10/24/80 All nuclear power anc reector cavity facilities holding ficacirq at Iadian Foint power reactor OLs init -
or cps 80-36 Failure ei Stean 10/10/80 All nuclear power Generatcr Support Bolting reactor facilities holding power reactor CLs or cps 80-35 Leakinq and dislodged 10/10/80 All categories G and Indine-124 implant seeds G1 redical licensees 80-34 "oron dilution of reactor 9/26/80 All pressurized water coolant durina steam reactor facilities renerator decentamination holding power reactor OLs 30-33 Determination of teletherapy 9/15/80 All teletherapy tir.er accuracy (G3) licensees 80-32 Clarification of certain 8/12/S0 All flRC and agreement requirements for Exclu-state licensees sive-use shipments of radioactive materials
- Operating Licenses or Construction Pernits v --
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