ML20064E363
| ML20064E363 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 11/07/1978 |
| From: | Parker W DUKE POWER CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7811160153 | |
| Download: ML20064E363 (3) | |
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i DUKE POWER COMPANY Powsm Bunanwo 422 Socin Cnuncu Srarer, CHAR 14rrE, N. C. 2824a m u a
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November 7, 1978 ViCE Patosotut TE LE P=oh t:Asta 704 Seca= Paoowctio=
373-4083 Mr. Harold R. Denton Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Re: McGuire Nuclear Station Units 1 and 2 Docket Nos. 50-369 and 50-370
Dear Mr. Denton:
1 3
Hy letter of June 29, 1978 applied for an extension of time for completion of McGuire Nuclear Station Units 1 and 2 until January 15, 1979 and October 15, 1979, respectively. Since my last letter, the construction and preopera-tional testing schedule for Unit I has been re-evaluated and several critical path activities have been re-scheduled. One of the major changes was defer-ment of the containment integrated leak rate test until after hot functional testing. As a result, the projected fuel loading date for Unit 1 is now February 1,1979.
The following is a discussion of some of the causes for the delay in comple-tion of Unit 1.
A precise quantitative assessment to determine the effect of each of these items on the schedule has not been performed and is not practi-cal. The purpose of the discussion of these items is to characterize the types of problems that have been experienced and demonstrate that good cause exists for the delay.
s 1.
Pipe Hanaer Problems Bergen-Paterson previously had the contract to furnish all pipe sttoort and restraint materials for McGuire. In addition, they also designed sse of the supports and restraints outside of the reactor building. With the cancella-5 tion of the contract with Bergen-Paterson in 1976, Duke instituted a program of checking and evaluating all of the piping supports and restraints for which Bergen-Paterson provided either materials or design information.
(See W. O.
Parker letter of August 20, 1976 to Dr. Ernst Volgenau which transmitted con-rtruction deficiency CD-369/76-6, -370/76-5.) Duke then undertook responsibi-lity for design and material procurement. which Bergen-Paterson previously hand-led.
In order to accomplish this, it was necessary to obtain additional man-power, a process which took approximately six months. Although it is impossible to measure exactly, it is estimated that this problem alone caused a three to five month delay in the overall schedule.
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Mr. Harold R. Denton Page Two November 7, 1978 2.
System Changes Numerous changes to various systems have been made over the last two years which have caused delays in releasing design drawings and necessitated re-working of systems which had previously been completed. These changes were required for a variety of reasons including (1) regulatory requirements, (2) proper system operation, (3) operational flexibility and (4) correction of deficiencies ob-served in preoperational testing. The following is a discussion of several of the more significant changes:
a.
Auxiliary Feedwater System A new auxiliary feedwater connection was added to each of the steam genera-tors. Extensive piping design changes, including new containment penetra-tions, were required to utilize the new connections. The purpose of these modifications was to minimize the potential for water hammer in the steam generators.
Changes to the suctior piping and valves on the auxiliary feedwater system were made to assure availability of water to the auxiliary feedwater pumps under all conditions. This involved addition of new piping to the system and control system changes to the motor operated pump suction valves.
(See W. O. Parker letter of April 12, 1978 to J. P. O'Reilly which transmits con-struction deficiency CD-369, -370/78-02.)
b.
Fire Protection As a result of the NRC review of the McGuire fire protection program, approx-imately 30 hose stations were added and additional spricklers were installed in the nuclear service water pump area, component cooling water pump area, residual heat removal pump rooms and corridors, cable room and battery room.
' _s Also, additional fire detection equipment, fire barriers and emergency light-ing were installed to meet NRC requirements.
c.
Containment Isolation Valves During preliminary leak rate testing of containment isolation valves, it was determined that several types of valves were not capable of meeting the estab-lished leakage acceptance criteria. Correction of this deficiency involved the replacement of approximately 26 valves and seat replacement in another 48 valves.
(See W. O. Parker letter of August 30, 1978 to J. P. O'Reilly which transmits construction deficiency CD-369, -370/78-06.)
3.
Preoperational Testing Approximately 40 of 149 preoperational tests have been completed to date. Sub-stantial problems were encountered in several tests which resulted in delays in completing the tests. The tests listed below are examples of tests that fall in this category:
Mr. Harold R. Denton Page Three November 7, 1978 Expected Actual Test Start Date Completion Date Completion Date Reactor Coolant 8/5/78 8/10/78 8/24/78 System Hydro-static Test Ccipenent Cooling 12/15/77 1/1/78 Not Completed Functional Test (Completion delayed pending replacement of containment isolation valves)
Upper Head Injec-2/14/78 2/21/78 7/15/78 tion System Func-tional Test Diesel Generator 8/1/78 9/15/78 Not Completed Testing (Testing delayed pending correction of several deficien-cies observed in preliminary tests)
Auxiliary Electric 1/15/78 2/1/78 10/1/78 Boiler Ice Loading and 2/20/78 7/20/78 Not Completed Weighing Operation (Completion delayed pending reinstallation of structural steel in intermediate deck door area.)
In recognition of the revised fuel loading date and to allow for contingen-cies, it is requested that the completion date specified in CPPR-83 for Unit 1 be extended to April 30, 1978.
It is further requested that the completion date specified in CPPR-84 for Unit 2 be extended until December 31, 1980 to allow for the delay which has resulted from the diversion of construction r
effort from Unit to Unit 1.
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William O. Parker, Jr WOP /sch