ML20003D231
| ML20003D231 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 02/12/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 8103190668 | |
| Download: ML20003D231 (3) | |
Text
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UNITED STATES y 't ) + ([J' &
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Docket No. 50-245 12 FEB 1981 0
R(((Th/j/(t Northeast Nuclear Energy Company A c; s
ATTN: Mr. W. G. Counsil D u,UQ 26
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Senior Vice President - Nuclear
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P. O. Box 270 2,
'* 70 Hartford, Connecticut 06101
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s Gentlemen:
This is written in response to your letter, W. G. Counsil to Boyce H. Grier, dated October 15, 1980.
Your letter requested that we provide you with Region I acceptance criteria for your forthcoming containment integrated leak rate test (II.RT) for "a test duration of less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />".
The existing Technical Specifications for Millstone Unit 1 require a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test duration. Any shorter duration ILRT requires an NRR approved Technical Specification change prior to conducting the test.
If the shorter duration ILRT is approved then we believe the test should meet the criteria contained in the enclosure to this letter.
Shuuld you have any further questions, please contact use Sincerely,
[g i
o ce H. Grier Director
Enclosure:
Region I Acceptance Criteria for ILRT Duration of Less Than 24 !1ours cc w/ encl:
J. F. Opeka, System Superintendent, Nuclear Operations E. J. Mroczka, Station Superintendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer
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Docket No. 50-245 ENCLOSURE Region I Acceptance Criteria for ILRT Duration of Less Than 24 Hours 1.
The test shall meet Technical Specifications and Appendix J Requirements for Conducting the ILRT.
2.
The testing method shall be identical to the method described in tne Bechtel Topical Report, BN-TOP-1, Revision 1, dated November 1, 1972; or the test method must be submitted to NRR for review and approval prior to conducting the test.
3.
The Mass Point Data Analysis Technique shall be included for detennining the leak rate test acceptability, 4.
The Absolute Test Method shall be used.
5.
The test duration shall be 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or greater.
6.
At least 20 sets of data points shall be taken at approximately equal time intervals and in no case at intervals greater than one hour.
The test results shall meet the following:
7.
Lmp @ 95% ULC + K < 0.75 L, where a
Lmp @ 95% ULC is the mass point leakage at the 95% upper confidence level L is the maximum allowable leakage at the required test pressure and a
K is a conservative correction factor including Type C additions for systems in operation Type C additions for systems not properly vented Corrections for containment free volume changes, for example, sump, reactor vessel and torus level 8.
The test shall not be concluded with an increasing calculated leak rate.
ENCLOSURE 2
Docket No. 50-245 9.
A 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or greater stabilization period will be required and the containment atmosphere will be considered stabilized when the change in weighted average air temperature averaged over an hour does not deviate by more than 0.50 R/hr from the average rate of change of temperature measured from the previous 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
- 10. The last four hours of the leak rate test may be used as the stabilization time for the verification test provided the above stabilization criterion is met.
11.
The figure of merit of the instrumentation system shall be less than 0.25 L -
a
.