ML19291C939
| ML19291C939 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/19/1975 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19291C937 | List: |
| References | |
| NUDOCS 8011140610 | |
| Download: ML19291C939 (2) | |
Text
{{#Wiki_filter:- (~ (-.. UNITED STATES NUCLEAR REGULATORY COMMISSION W ASHINGToN, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPCRTING AMENDMENT NO. 12 TO FACILITY OPERATING LICENCE DPR-3 ~ (CHANGE NO. 117 TO THE TECHNICAL SPECIFICATIONS)
== == YANKEE ATOMIC ELECTRIC COMPANY YANKEE ATOMIC POWER STATION (YANKEE-ROWE)_ DOCIET NO. 50-29 1= Introduction By letter dated February 14, 1975, Yankee Atomic Electric Company (the licensee) requested an extension of the date for conducting the next control rod drop testing at Yankee-Rowe. The performance of this specified [# surveillance would require shutdown of the Yankee-Rowe plant on February 22, +:: 1975, since control rod testing must be conducted with the reactor in the hot standby mode. The requested extension of the twelve-week surveillance interval by four (4) weeks until March 22, 1975, would primarily provide the licensee relief from shutting down the reactor at a time that electric power from Yankee-Rowe is needed, because of outage of other major generating units in the area. \\l { Discussion The control rod surveillance program presently specified for Yankee-Rowe includes requirements incorporated in the facility licence by our issuance of Change No. 104, dated Novembur 15, 1972. The surveillance involves shutting down the reactor every 12 weeks for measuring the drop time of each control rod to verify that the control rods meet the limiting condition for operation, viz., a drop time of 2.4 seconds. This control rod surveillance program is descriled in the licensee's Proposed Change No.104, dated 1 Novenber 7,1972. The nore frequent than usual surveillance every 12 weeks !1 i was instituted following the installation of new control rods at Yankee-Rowe because of control rod malfunctions. It was designed to establish confidence in the long-term capability of the replacement control rods to perform the intended function when needed. g.uw 5
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b = ~ p= - E.... = Evaluation The licensee's request only involves a temporary four-week extension of the specified 12-week surveillance interval. The specified LCO rer.ains un-changed. The licensee has reported the results of the control rdd drop testing carried out since November 1972, involving eight rractor shutdowns for performing the drop tests. The limiting control rod duop time of 2.4 seconds was never exceeded. We find that the repeated acceptable performance of the control rods provides a high degree of confidence in the continued G capability of the control rods to function reliably. In addition, since we now approve a control rod surveillance interval of up to 18 months in Technical Specifications currently being issued for other facilities, we find p. that the requested tecporary extension of the surveillance interval from [ 12 to 16 weeks, for periu ming the drop testing of the Yankee-Rowe control [.... rods, is acceptable. We also. find that this extension in the control rod E surveillance interval does not increase the probability or consequences of accidents previously analyzed, nor does it decrease any safety margins, since the LCO's recain unchanged. The attachment to License Amendment 12, Change No.117 authorizes the licensee's request. Conclusion We have concluded, based on the reasons above, that the authorization of this change does not involve a significant hazards consideration. We also conclude that there is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, etra (ii) that such activities vill be conducted in compliance with the Commission's regulations and the issuance of this amendment will not j -- beinimicaltothefo=mondefeseand F ecuritygrtotheheathandsafety f yL dpkeg-( h p p f pe4}; of, the publicj ei m ( l j,[ i b SM 'iW)
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