ML19326B879
| ML19326B879 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/20/1975 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19326B877 | List: |
| References | |
| NUDOCS 8004180610 | |
| Download: ML19326B879 (3) | |
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UNITED STATES NUCLEAR - REGULATORY COMMISSION j
W ASHINGToN. D.
C.
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 7 TO FACILI'lY LICENSE NO. DPR-51 CHANGE NO. 7 TO THE TECHNICAL SPECIFICATIONS ARKANSASPOWERSLIGNTCOMPANY ARKANSAS NUCLEAR ONE - UNIT 1 DOCKET NO. 50-313 INTRODUCTION By letter dated October 7,1975, Arkansas Power 6 Light Company (APSL) requested an snendment to Facility License No. DPR-51 for Arkansas Nuclear One - Unit 1 (ANO-1).
The request involves revisions to the Technical Specifications with regard to:
1.
Establishing operating bands for the level an'd chemical concentration-for the Borated Water Storage tank, the Sodium Thiosulfate tank, and the Sodium Hydroxide tank.
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2.
Shifting the emergency pond leve1 specification and surveillance requirement from pond surface elevation and pond depth to pond depth only plus providing a time interval during which the minimum pond depth need not be maintained; and 3.
Changing the tendon surveillance frequency requirement to be consistent with Regulatory
- Guide 1.35, Revision 1 (June 1974).
This evaluation concerns only item 3 above.
Items 1 and 2 are unrelated-and they will be evaluated at a later date.
DISCUSSION The current Nuclear Regulatory Commission staff position regarding the inservice inspection of prestressed concrete (ungrouted tendon) reactor compartments is stated in Regulatory Guide 1.35, Revision 1 (June 1974),
" Inservice Inspection of Ungrouted Tendons in Prestressed Concrete Containment Structures." This revision replaced the original Regulatory Guide 1.35, dated February 5,1973. These guides differ in the following areas:
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Revision I changes the tendon test frequency from 1, 2 and 3 years after the initial containment structural test (ICST),
and every 5 years thereafter t'o 1, 3 and 5 years after the ICST and every 5 years thereafter.
- 2. - The revision permits a reduction in the number of tendons tested if experience shows that there are no significant problems with the prestressing tendons, and 3
The revision alters the reporting requirements for defective or degraded tendons or anchorage hardware to conform with Regulatory Guide 1.16.
The ANO-1 specification and test procedure concerning containment tendons are found in Technical Specification 4.4.2.1 of Appendix A to Facility License DPR-51 and ANO-1 Operating Procedure No. 1304 91,
. Revision 1 (February 21, 1975), respectively.
EVALUATION The ANO-1 tendon surveillance provisions set forth in Technical Specification 4.4.2.1 and Operating Procedure No. 1304.91, Revision 1 differ from the current NRC~ staff position on ungrouted tendon surveillance (Regulatory Guide 1.35, Revision 1), in the following respects:
1.
The testing frequency corresponds to that of-the original Regulatory Guide 1.35 (February 1973).
2.
No provision is made to reduce the number of tendons to be tested as provided in Revision 1 to Regulatory Guide 1.35.
3.
The reporting requirements differ from both the original and Revision 1 to Regulatory Guide 1.35 in that a tendon surveillance test report is required to.be submitted following every test vice just those tests which uncover degraded tendons or associated equipment. The remainder of the reporting requirements for tendon surveillance are stipulated in Technical Specifications '1.8.5 and 6.12.3.1 (definition and reporting
-of abnormal events involving degradation of containment boundaries).
Specification 6.12.4(b) requires a written report within 90 days after completing the tendon surveillaa.i tests.
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We find that the present ANO-1 tendon surveillance specifications discussed in items 2 and 3 above are more conservative than the requirements set forth in Regulatory Guide 1.35, Revision 1.
Since the requested testing frequency of the tendon surveillance is equivalent to that required by the Regulatory Guide and since the remaining tendon surveillance requirements, presently in effect are more cons.+evative than the Regulatory Guide, we conclude that the requestm. eb-no is acceptable.
CONCLUS.L We have conca ucca, based on the considerations discussed above, that:
(1) because the change does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the change does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and. (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be '
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.m cal to the common defense and security or to the health and safety of tne public.
Date:
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