ML20137G277
| ML20137G277 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 08/20/1985 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20137G280 | List: |
| References | |
| NUDOCS 8508270254 | |
| Download: ML20137G277 (3) | |
Text
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o DUKE POWER GOMPANY P.O. HOX 33180 0HARL(FFTE. N.C. 28242 HAL B. TUCKER TELEPHONE vaca emesseswr (704) 073-4531 maa. man emoovenos August 20, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Ms. E. G. Adensam, Chief Licensing Branch No. 4
Subject:
McGuire Nuclear Station Docket Nos. 50-369 and 50-370 Technical Specification Amendment.
Containment Integrated Leak Rate
Dear Mr. Denton:
Attached are proposed license amendments to Facility Operating Licenses NPF-9 and NPF-17 for McGuire Nuclear Station Units 1 and 2, respectively.
The proposed amendment seeks to increase the integrated leak rate permitted by Technical Specification 3.6.1.2 to 0.30% per day from its current value of 0.20% per day. The proposed change is brought about by clearly allowing credit for iodine removal by containment spray and to increase the margin between the measured leak rate and the acceptance criteria for the test.
Historically, the Integrated Leak Rate Test (ILRT) results shows some vari-ability making McGuire units susceptible to an ILRT failure. The maximum integrated leak rate value is limited to 0.20% per day by the current Technical Specification to ensure that offsite radiation exposure does not exceed the reference values specified in 10 CFR 100.11.
Duke Power Company has recently revised the radiation exposure calculation for a design basis LOCA using the methodology prescribed in the latest revi,
tion of the Standard Review Plan (SRP). Section 6.5.2.
The Standard Review Plan now clearly allows credit for iodine removal during a LOCA by a boric acid containment spray system. Our calculation demonstrates that an increase in overall leakage rate to 0.30% per day would be nearly offset by the iodine removal credit allowed in SRP Section 6.5.2.
Since noble gases are unaffected by containment sprays, there is an increase in the whole body and skin doses.
However, for McGuire, thyroid exposure is the limiting criteria, and the whole body and skin doses are still well within the values found in 10 CFR 100.11 and CDC 19.
There is thus adequate technical justification to relax the current limit on the integrated Icak rate by 50%.
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8508270254 850820 i
PDR ADOCK 05000369
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Mr. Harold R. Denton, Director August 20, 1985 Page 2 We request review and approval prior to the next ILRT, scheduled for Unit 2 during the next refueling outage. This is currently planned to start in February, 1986.
Attachment I contains the proposed changes to the Technical Specifications.
Attachment II provides a Justification and Safety Analysis in support of the proposed changes. Att,achment III provides an analysis performed pursuant to the requirements of 10 CFR 50.91; this analysis concludes that the proposed changes to the Technical Specifications do not involve any significanc haz-ards consideration.
This request involves one application for amendment to the McGuire Technical Specifications. Accordingly, pursuant to 10 CFR 170.21 a check for $150.00 is enclosed.
Please feel free to contact us if you require any additional information.
Very truly yours,
<A k Hal B. Tucker JBD:smh Attachments cc:
Dr. J. N. Grace, Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30323 W. T. Orders Senior Resident Inspector McGuire Nuclear Station Mr. Dayne Brown, Chief Radiation Protection Branch Division of Facility Services Department of Human Resources P. O. Box 12200 Raleigh, North Carolina 27605
Mr. Harold R. Denton, Director August 20, 1985 Page 3 HAL B. TUCKER, being duly sworn, states that he is Vice President of Duke Power Company; that he is authorized on the part of said Company to sign and file with the, Nuclear Regulatory Commission this revision to the McGuire Nuclear Station License Nos. NPF-9 and NPF-17 and that all statements and matters set forth therein are true and correct to the best of his knowledge, gb r
Hal B. Tucker, Vice President Subscribed and sworn to before me this 20th day of August, 1985.
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