ML19347C517
| ML19347C517 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/16/1962 |
| From: | Bryan R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19347C516 | List: |
| References | |
| NUDOCS 8011200080 | |
| Download: ML19347C517 (3) | |
Text
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Q HAZARDS ANALYSIS BY THE RESEARCH AND POWER REACTOR SAFETY BRANCH DIVISION OF LICENSING AND REUIATION IN THE MATTER OF YANKEE ATOMIC ELECTRIC COMPANY PROPOSED CHANGE NO.18 Introduction Pursuant to the provisions of paragraph 3.A of License No. DPR-3, as amended, Yankee Atomic Electric Company in Proposed Change No. 18, dated February 1,1962, recuested authorization to revise certain i
portions of the Normal Plant Operating Instructions which are contained in Section 50h of the license application. Paragraph D.1 of the technical specifications, which are attached as Appendix A to Yankee's operating license, provides that the Objectives, Conditions and Precautions set forth in Section 50h of the license application will be observed. Accordingly, any change which is to be made in those portions of the Normal Plant Operating Instructions must receive prior Con.ission approval.
Discussien P oposed Change No.18 provides for the revision and consolidation of the following Normal Plant Operating Instructions:
50h AI - Plant Startup - Reactor Startup from Cold Condition 50h A2 - Plant Startup - Reactor Startup from Hot Standby 50h A3 - Plant Startup - Reactor Startup Following Scram Condition 50h C1 - Plant Shutdown - Scheduled Reactor Shutdown l
l 50h C2 - Plant Shutdown - React or Cooldown 50h Dh - Main Coclant System - Startup of Complete System 50h E - Pressure Control and Relief System l
50h F - Charging and Volume Control System In addition, Operating Instruction 50hD7, Main Coolant System - Shutdown cf Ccmplete System, which was inadvertently left off the list in the l
Proposed Change, would also be revised and consolidated. In place of these Operating Instructions, three new and more comprehensive Operating Instructions would be used to govern the operations involved. TMse are as follows:
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, 50h Al - Plant Startup - Primary Plant Startup from Cold Condition 50h A2 - Plant Startup and Shutdown - Startup from Hot Standby Condition; Shutdown to Hot Standby Ccndition 50h C2 - Plant Shutdown - Reactor and Primary Plant Cooldown Yankee has now operated its reactor at power for a period well in excess of one year. Such operation has afforded Yankee an opportunity.to review the adegaacy of the present Operating Instructions aid to determine their need for revision. It is Yankee's opinion that the new Operating Instructions which they are now proposing are simpler, more concise and easier to follow than the present Operating Instructions. They believe that use of the revised Operating Instructions would increase the efficiency of performing the operations involved, and also that the proposed revision of the Operating Instructions would result in no basic change in the operation of the plant.
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We have reviewed the Proposed Change and have noted several items which we believe should be altered from those contained in Proposed Change No. 18. These revisions, in which Yankee concurs, are for the purpose of clarification and to eliminate reference in the Technical Specifications
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to the regairements of a document which was not a part of the license application. The revisicns are as follows:
Operating Instruction 50hAl The recuirements of this section III Precautions 5.c.
should be changed to read "The pressurizer temperature and pressure rust be controlled so that proper overpressure is maintained on the nain coolant pumps".
Operating Inst: action 50hAl The first sentence should be changed III Precautions lh to read "Daring normal approach to criticality a flux rultiplication rate of 1 decade / minute or less is acceptable",
Operating Instruction 50hAl This precaution should be revised III Precautions 15 to read "Daring normal approach to criticality, control rod withdrawal should be interrupted for approxi-mately 1 minute whenever the count rate is doubled".
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. Operating Instruction 50hC2 The reqairements of this section III Precautions 1 should be revised to read "The pressurizer temperature and pressure must be controlled so that proper overpressure is maintained on the main coolant pumps and so that pressure commensurate with the change in reactor vessel NDT is not exceeded".
Operating Instruction 50hC2 This precaution should be chtnged III Precautions h to read "Since reactivity is being inserted as the reactor is cooled down, special attention should be directed to the neutron instru-mentation during this period".
In addition to the above revisions, the provision below should be added to the Precautions listed under Operation Instruction 50h A2 in order to insure that the spray line isolation valves, whose installation is being authorized by Change No. 12, will always be open when the reactor is operated at a substantial power level.
Operating Instruction 50hA2 This new precaution should be as III Precautions 9 follows:
"The pressurizer spray
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line shall not be isolated when the reactor power level is greater than 5 W thermal".
Cenclusion It is our opinion that Proposed Change No.18 should incorporate the revisions which have been indicated. With such revisions, it is our opinion that Proposed Change No. 18 does not present significant j
hazards considerations not described or implicit in the license j
application as amended to June 23, 1962 In addition, we cenclude that there is reasonable assurance that the health and safety of the j
public will not be endangered by operation of the facility as proposed and as revised.
0:i;i:#End by Rdut H. Erin l
Robert H. Bryan, Chief l
Research & Power Reactor Safety Branch l
Division of Licensing and Regulation Date:
O 16 G2 l
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