ML19338G614
| ML19338G614 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/27/1980 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| 1-100-07, 1-100-7, 2-100-09, NUDOCS 8010310345 | |
| Download: ML19338G614 (4) | |
Text
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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK, ARKANSAS 72203 (501) 371-4000 October 27, 1980 1-100-07 2-100-09 Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555
SUBJECT:
Arkansas Nuclear One-Units 1 and 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 Implementation of NUREG-0578 Category "B" Requirements (Fi1e:
1510.3, 2-1510.3)
Gentlemen:
AP&L is currently in the process of planning for the early 1981 refueling outages for both ANO-1 and ANO-2. ANO-1 is presently scheduled to begin its refueling outage on January 2,1981, at which time AP&L will complete implementation of the NUREG-0578 Category "B" requirements.
In order to meet the NRC schedule for the Category "B" requirements for ANO-2 it would be necessary for it to be shut down about the same time as ANO-1.
If such a shutdown were required, the unit would start back up after the necessary modifications were made, operate for the approx-imately 40 EFPD's remaining in the fuel cycle, and then shut down for the refueling outage.
It is impractical to shorten the AN0-2 fuel cycle by 40 EFPD, because it would invalidate the present reload analysis, which is nearly complete at this time.
Because of the design of AN0-2, a twelve month lead time is required for this analysis process to generate software updates for the Core Protection Calculator system.
AP&L has taken positive action in order to meet the Lessons Learned Category "B" requirements and schedules. ANO-2 presently meets the Category "B" requirements of Items 2.1.5, Dedicated H2 Control Penc-tratior.s; 2.1.7.a Safety Grade Auto Initiation of AFW; and 2.1.7.b Safety Grade AFW Flow. The Category "B" requirements for Item 2.1.6.b, Plant Shielding, have been completed, except for a procedure change which will be made to assure isolation of letdown and seal return when core damage exceeds a point at which radiation levels become a hindrance to access around vital areas. This procedure change will be made prior to January 1,1981.
MEMBER MIDDLE SOUTH UTILITIES SYSTEM
Mr. Darrell G. Eiser. hut -
October 27, 1980 The status of the other Category "B" requirements is as follows:
Item No. 2.1.8.a Post-accident Sampling -- AP&L is constructing a new building solely to meet this requirement; has purchased necessary equipment; and has designed a system which meets or exceeds the requirements.
AP&L has expedited the design and construction of this facility, which would be completed by Jan-uary 1,1981, except for possible valve procure-ment problems, which result from the tight sched-ule, and the necessity of a plant shutdown to make sample line connections.
Item No. 2.1.8.b In containment High Range Radiation Monitors --
Currently, only two vendors are available to work on the qualification program necessary to meet the requirements. AP&L is presently working with both vendors and plans to install the monitor which first meets the qualification requirements of NUREG-0578.
Both vendors are presently nearing completion of their qualification programs.
Pre-liminary information, however, indicates that these test programs, like previous programs, may not have met the requirements If, however, the requirements are met, the mon,.o r will be available for installation by refueling.
Item No. 2.1.9 Transient and Accident Analysis -- Containment Pressure Monitors have been ordered and the sched-ule expedited by AP&L.
They are presently sched-uled to arrive some time in November.
However the vendor has previously had three schedule slips. AP&L has closely followed the vendor's efforts and has expedited, as much as possible, delivery of the monitors.
It should be noted that ANO-2 currently has installed four safety grade, qualified, con-tainment pressure transmitters which indicate 1 to 70 psia.
ANO-2 currently has installed two safety-grade, qualified, wide range water level indicators (which indicate 46" to 128" above the top of the sump). We have committed to install one safety grade, qualified water level indicator which indicates from the bottom to the top of the sump, and to modify existing instru-mentation to provide indication from the top of the sump to a level corresponding to at least 600,000 gal-lons of liquid.
Necessary equipment is currently scheduled to arrive before January 1,1981.
- However, the vendor has previously had a one month schedule slippage. AP&L has closely followed the vendcr's efforts and has expedited, as much as possible, delivery of the indicators.
z Mr. Darrell G. Eisenhut October 27, 1980 AN0-2 currently has installed two safety-grade, qualified hydrogen monitors which indicate 0 to 5 percent hydrogen. We are planning to modify this equipment to monitor 0 to 10 percent hydro-gen, in accordance with Category "B" requirements, during the refueling shutdown. The design for the RCS vents is complete.
Equipment is scheduled January 1, 1981 implementation, however a refueling shutdown condition is necessary for installation.
Item No. 2.2.2.B, Technical Support Center -- AP&L is constructing a new building solely to meet this requirement.
The building construction is 85% complete. The total projaut, which includes instrumentation, equipment installation and communicaiton tie-ins is 32% com-plete. The physical duct bank is in, with the cable pulling remaining to be done. A unit outage is necessary for instrumentation tie-ins.
Concurrent AN0-1 and AN0-2 refueling outages would cause a severe strain on manpower resource. Staggered shutdowns would allow AP&L employees to apply the knowledge gained from making the AN0-1 Lesson Learned modifications to making the ANO-2 modifications. Many of the same skilled employees would be available to do the necessary work for both units if done during staggered shutdowns.
Concurrent ANO-1 and AN0-2 refueling outages would also cause a severe strain on the turbine building laydown area. Both low pressure turbine rotor shells and possibly the high pressure turbine rotor shells for both AN0-1 and AN0-2 must be removed. Significant Moisture Separator-Reheater (MSR) work must also be accomplished on ANO-1. This would result in staggered working sched-ules on the turbines because of the very crowded conditions on the turbine deck, which is shared by the two units. This would also result in extending the total time required to work on the turbines, compared to having the units down at different times.
Another problem with concurrent refueling outages is Middle South Utilities system availibility. The load forecast for January,1980 is about '900 MW.
Projected capacity out for scheduled maintenance or other reasons totals 4164 MW. With a net system capacity of 13,891 MW, this leaves a reserve of 827 MW, including ANO-2. With AN0-2 out of service for Lessons Learned modifications, we would be in the position of Middle South Utilities not being able to adequately supply its customers' projected energy needs without purchasing power from other sources.
It should be recognized, though, that some portion of this purchased power would have to come from sources that are in winter peaking regions such as the South Eastern Electric Reliability Council, Mid-Atlantic Area Council, and the North East Power Coordinating Council.
Mr. Darrell G. Eisenhut October 27, 1980 As a result of these concerns and problems, AP&L requests relief in implementation of the Lessons Learned Category "B" requirements for ANO-2. We propose that the modifications be made during the refueling outage currently scheduled to begin around mid-March,1981.
Very truly yours, d)wlc.974A David C. Trimble Manager, Licensing DCT: MAS:pw l
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