ML19345C631
| ML19345C631 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 11/24/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 8012080029 | |
| Download: ML19345C631 (1) | |
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90 UNITED STATES
+o NUCLEAR REGULATORY COMMISSION i
E REGION 11
) N' 101 MARIETTA ST., N.W. SUITE 3100 2b' ATLANTA, GEORGIA 30303
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NOV 2 41980
- 21, 50-346#pfgcd.RII:JP0_CiSIPk' hgytCESA In Reply Refer TE 50-424,-50-425 Georgia Power Company ATTN:
J. H. Miller, Jr.
Executive Vice President 270 Peachtree Street Atlanta, GA 30303 Gentlemen:
The enclosed Information Notice is provided as an early notification of a possibly significant matter. Recipients of this Notice'should review the information for possible applicability to their facilities.
However, no specific action or response is requested at this time. If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or' request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
%L J$ mesi). O'Rei Director 4
Enclosures:
1.
IE Information Notice No. fs0-42 2.
List of Recently issued IE Inforcation Notices cc w/ encl:
M. Manry, Plant Manager C. E. Belflower, Site QA Supervisor W. A. Widner, Vice President and
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Genera! ilanager-Nuclear Generation K. M. Gillespie, Construction Project Oanager E.'D. Groover, QA Site Supervisor D. E. Dutton, Project General Manager 8012080 b
029 r
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SSINS No.:
6835 Accession No.:
UNITED STATES 8008220261 NUCLEAR REGULATORY COMMISSION IN 80-42 0FFICE OF INSPECTION AND ENFORCEMENT 4
WASHINGTON,D.C. 20555
-November 24, 1980 IE Information Notice No. 80-42: EFFECT OF RADIATION ON HYDRAULIC SNUBBER FLUID Description of Circumstances:
On Augusv 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 suppressors mounted on the reactor coolant pumps.
This upper limit was obtained from the results of a study performed for FPC by Rensselaer Polytechnic 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 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 result showed that hydrochloric acid (HC1) was formed in significant quantities 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)
~D 2.78 1.2 1 minute 70.3 58 5 minutes 329.
5.8 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> 335.
- d.5 11.2 minutes 555 50.3 15.2 minutes 1592 One of the recommendations by the RPI personnel was that the fluid be replaced before a limit of approximately 6 Mrads was reached. FPC reported that the fluid in cervice at Crystal River No. 3 plant had absorbed doses ranging from 2.3 to 3.6 drads,these values were determined by comparing the viscosity of the fluid in service to that of the test samples at RPI. The Technical Instruction Maca-1 that is provided by the vendor for these suppressors contains a recommendation that 12.5 Mrads should be the maximum service life for Versilube F-50.
This IE Information Notice 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 or response is requested at this time.
If NRC evaluations so indicate, further licensee actions may be requested or required.
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- IN 80-42.
Novisber 24, 1980 Pag'e 2 of 2-
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'No' written' response to,this IE Information Notice is~ required.
If you have any questions regarding this matter please contact the Director'of the appropriate NRC Regional Office.
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f IN 80-42 November 24, 1980 RECENTLY ISSUED' IE INFORMATION NOTICES Information Date of Notice No.
Subject Issue Issued to 80-42 Effect of Radiation on 11/24/80 All n.uclear power reactor Hydraulic Snubber Fluid facilities with an OL or CP
'80-41 Failure to Swing Check Valve 11/10/80 All nuclear power reactor
.in the Decay Heat Removal facilities with an OL System at Davie-Besse Unit or CP No. 1 80-40 Failure Of Swing Check 11/10/80 All power f 111 ties Valve In The Decay Heat with and OL or CP Removal System At Davis-Besse Unit No.-1 80-39
' Malfunctions Of Solenoid 10/31/80 All light water reactor-
.l Valves Manufactured By Valcor Engineering Corporation facilities holding power reactor OLs or cps 80-38 Cracking In Charging Pump 10/30/80 All PWR-facilities Casing Cladding with an OL or CP 80-37 Containment cooler leaks 10/24/80 All nuclear power and reactor cavity flooding at Indian Point facilities holding Unit 2 power reactor OLs or cps 80-36 Failure'of. Steam l
10/10/80 All nuclear power Generator Support Bolting reactor facilities holding power reactor j
- 0Ls or cps 80-35 Leaking and dislodged 10/10/80 All categories G and Iodine-124 implant seeds G1 medical licensees 80-34
. Boron dilution of reactor 9/26/80 All pressurized water coolant during steam reactor facilities generator decontamination holding power reactor OLs 80-33 Determination of teletherapy 9/15/80 All teletherapy timer accuracy (G3) licensees
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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 Boveri Type 480 volt type K-600S and facilities holding OLs or cps K-DON 600S circuit breakers
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