ML20078E930
| ML20078E930 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 09/22/1983 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | BOSTON EDISON CO. |
| Shared Package | |
| ML20078E932 | List: |
| References | |
| NUDOCS 8310070048 | |
| Download: ML20078E930 (5) | |
Text
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7590-01 UNITED STATES OF AMERICA NUCLEAR REGULATORY CO.'"!ISSION In the Matter of.
)
)
Boston Edison Company
)
Docket No. 50-293
)
(Pilgrim Nuclear Pcwer Station)
)
Modification of January 13,1981 and January 19, 1982 Orders I.
I The Boston Edison Company (the licensee) is the holder of Facility Coerating License No. DPR-35 which authcrizes the licensee to operate the Pilgrim Nuclear Power Station at power levels not in excess cf 1998 megawatts thermal (rated power).
The facility is a boiling water reactor located at the licensee's site in Plymouth County, Massachusetts.
. II.
On January 13, 1981 the Commission issued an Order modifying the license requiring: (1) the licensee to promptly assess the suppression pool hydrodynamic loads in accordance with NE.'0-24583-1 ard the Acceptance Criteria contained in Appendix A to NUREG-0661; and (2) design and install any plant modifications needed to assure that the facility conforms to the Acceptance Criteria contained in Appendix A to NUREG-0661.
The Order, published in the Federal Register on January 28,1981 (46 FR 9305) required that installation of any plant modifications needed to provide compliance with the Acceptance Criteria in Appendix A to NUREG-0661 be completed not later than Septembar 30, 1982, or, if the plant 8310070048 830922 l
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is shutdown on'that date, before the resumption of power thereafter. On January 19, 1982, the Commission issued an Order modifying the completion date specified in Section V of the January 13,1967 Order. The Order, published in the Federal Register on January 25,1982 (47 FR 3650) changed the ccmpletion date to pricr to the start of Cycle 7 (at the completion of the licer.see's 1983 refueling outage).
III On October 31, 1979, the staff issued an initial version of its acceptance criteria to the affected licensees. These criteria were subsequently revised 1
in February 1980 to reflect acceptable alternative assessment techniques which would enrance the implementation of this program. Throughout the development of these acceptance criteria, the staff has worked closely with the Mark I Owners Group in order to encourage plant-unique assessments and modifications to be undertaken.
Since the development of these acceptance criteria significant progress has been made and all of the major modifications have been completed. However.
in a May 10, 1983 letter, the licensee stated that additional time is needed to complete the modifications of: (1) the torus catwalk extension suppcrt legs, and (2) ring girder to torus shell weld near the T-quenchers to assure accident induced loads are within Mark I Containment Long Term Program acceptance criteria. This additional time is needed to permit the licensee to accomplish the goals of its long-term program for scheduling plant modifications.
Rescheduling these modifications will enable the licensee to more effectively manage and control safety related modifications.
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s 1 Both the catwalk-extension support legs and ring girder to torus shell welds 1
were shown to meet the acceptance criteria of the Mark I Containment Short Term Program, thus providing a safety factor of 2 based on ultimate strength.
- The licensee stated in its May 10, 1983 letter that, although calculated
- loads exceed the Mark I Containment Long Term Progran Acceptance Criteria, failure would not cccur and the pressure suppression chamber boundary would remain in tact. The licensee has also stated that the catwalk extension support legs provide no safety related function and that their deformation under accident induced loading conditions would have no impact on safety related structures or equipment.
In this regard, the staff concluded in December.1977 in NUREG-0408 "" ark I Containment Short Term Program" that a safety _ factor to failure of at least 2 exists in the containment system for each operating Mark I BWR facility and that each Mark I containment system 4
would maintain its integrity and functional capability in the event of a I
design basis LOCA.
t These modifications would be the only items identified in the Mork I long Term Program not completed in accordance with the provisions of the January 13, 1981 and January 19, 1982 Orders. The Commission believes that since all the modifications will have been completed except for the torus catwalk extension support legs and the ring girder to torus shell welds most of the intended margins of safety of the containment systems will have i
been achieved.
d
4-s The Commission has therefore determined to permit an extension by approxi-mately ten months of the previously imposed completion dates for needed plant modifications until prior to restart from the mid-Cycle 7 nodification outage (now scheduled for February 1985). This Order continues in effect the Exemp-tion to General Design Criteria 50 of Appendix A to 10 CFR Part 50, granted on January 13, 1981 IV Accordingly, pursuant to the Atomic Energy Act of 1954 as amended, including Sections 103 and 1611 and the Commission's regulations in 10 CFR Parts 2 and 50, IT IS ORDERED that the completion date specified in Section V of the January 13,1981 " Order for Mcdification of License and Grant of Extension of Exemption" as modified by the Orcer of January 19, 1982, for the items listed in Section III of this Order, is hereby changed to read as follows:
" Prior to restart from the mid-Cycle 7 Modification Outage." The Order of January 13, 1981, except as modified herein, remains in effect in accordance with its terms.
V The licensee may request a hearing on this Order within 20 days of the date of publication of this Order in the Federal Register. A request for hearing shall be submitted to the Director, Office of Nuclear Reactor Regulation, U. S. Nuclear Regulatory Commission, Washington, DC 20555 Copies of the request shall also be sent to the Executive legal nirector at the same address.
i
i 5-If a hearing is to be held, the Commission will issue an Order designating the time and place of any such hearing.
If a hearing is held concerning this Order, the issue to be considered at such a hearing shall be whether the completion date specified in Section 'l of the January 13,1981 " Order
. for Modification of License and Grant of Extension of Exemptfor." should be changed for the items listed in Section III of t.1is Order to: " Prior to restart from the mid-Cycle 7 Modification Outage."
This Order shall become effective upon the licensee's consent or upon expira-tion of the period within which a hearing may be recuested or if a hearing is requested by the licensee, on the date specified in an Order issued follow-ing further proceedings on this Order.
FOR THE NUCLEAR REGULATORY COMMISSION i
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. Eisenii t',
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Division of Licensing Office of Nuclear Reactor Regulation Dated at Bethesda, Maryland this 22nd day of September,1983 F
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