ML20207Q828
| ML20207Q828 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 03/02/1987 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737 NUDOCS 8703100047 | |
| Download: ML20207Q828 (3) | |
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Duxu POWER GOMPANY P.O. Box 33180
' f ; L H. TUCKEH TELEPHONE CHARLOTTE, N.C. 28242
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March 2, 1987
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a U.S., Nuclear _ Regulatory Commission
&Docume=rce.er gn.ag Washington, D.C.
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Subject:
McGuire Nuclear Station Docket Nos. 50-369, -370 Centlemen:
My letter dated March 29, 1984 provided a response to NUREG-0737, Supplement I which included a schedule for completion of Control Room Review /HED Modifications.
The present status of our' efforts is provided herein.
d-For McGuire Unit 1, there were originally planned 149 HED modifications. The number of HED modifications completed through the last (1986) refueling outage was 131 or 87.9%.
This is compared to a committed completion percentage of 75%.
There are 18 HED modifications left to implement of which 15 are planned for completion during the 1987 McGuire Unit I refueling outage. The three which will not be totally completed are HED's M-1-004, -188. -520.
HED M-1-004 The following summary of the modification is provided:
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o Remove colored film from annunciator tiles, except on panels IF01 and 1ADI i o Lower annunciator volume o convert several status light panels to annunciator panels l
o Add 21 new annunciators and new status lights I
o Delete 40 annunciators and status lights o Complete 408 rearrangements within specific annunciator and status light panels o Move 273 annunciators and status lights to other panels o Reengrave 341 annunciators and status lights o Interlock several annunciators with another plant condition for alarm.
As can be seen, this modification represents an extensive change to the Control Room alarm system.
It is strongly felt that the modification should be installed in two parts to reduce total Control Room / control board work rate.
Duke considers that given to total number of HED modifications being completed l
this outage (15), that to complete the entire scope of annunciator modifications this outage would place an unreasonable burden on the Control Room operators and could potentially create an unsafe condition. Duke would rather minimize this total impact by spreading this,HED modification over two refueling outages, p
0703100047 B70302 PDR ADOCK 05000369 l D p
' - Document Control-Desk March 2,'1987' Page 2 HED's M-1-188, -520 These HEDs involve.the complete rearrangement and upgrade of the Ventilation Systems (HVAC) Control Panel located outside of the main control board area, i
McGuire's HVAC Control Panel houses controls and indication for the following ventilation systems on both units:
o VU - Upper Containment i
o VL - Lower Containment -
l o VP - Containment Purge o VE - Annulus o VX - Containment Air Return and Hydrogen Skimmer o VA - Auxiliary Building.
o VF - Spent Fuel Pool Building o VC - Control Room The panel consists of control switches, flow indication meters, status lights, and
-annunciators. Our chief difficulty with this modification lies in our inability to install the modification when viewed in the context of an operating plant.
Much of the modification work involves relocating controls and indications to new locations on the panel. This entails reciprocating sawing of new openings and weld repair of vacated openings and must be accomplished in extremely close-proximity to controls and indications of operating components and systems. Many of the above listed ventilation systems are required for mitigating possible 2
accidents while at power, some systems are required during shutdown to maintain 3
clean air within the Reactor Building and, of course VC-is required to support
. Control Room cooling. Because of the inherent complexities and high risks assoc-isted with attempting to modify the existing HVAC Control Panel, installation of the above modifications cannot proceed in 1987.
Duke is in the process of thoroughly evaluating all of our options with respect to these HVAC panel modifications.
Once a decision has been reached, NRC will be advised.
Thus, for McGuire Unit 1,15 1/2 HED modifications are planned for 1987 with the remaining half of the annunciator work planned for 1988. The two HED modifica-tions associated with the HVAC panels are on hold pending the results of an ongoing evaluation. By the end of the 1987 Unit I refueling outage (End of L
Cycle 4), Duke will have implemented 98.3% of the HED modifications.
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' For McGuire Unit 2, there were originally planned 158 HED modifications. The number of HED modifications completed through the last (1986) refueling outage was 122 or 77.2%.
This is compared to a committed completion percentage of 60%.
There are 36 HED modifications left to implement of which 23 are planned for completion durinr the 1987 McGuire Unit 2 refueling outage.
Following successful completion of these HED modifications, this would result in a completion percen-tage of 91.7% (as compared to a commitment of 80%). For the 1988 refueling outage
~of McGuire Unit 2, Duke plans to implement 10 of the remaining HED modifications.
The three which are currently not planned for implementation in 1988 are HED's M-1-188, -520. -152.
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l Document Control Desk March 2, 1987 Page 3 Like Unit 1, these three modifications involve the HVAC panels. HED-152 involves the replacement of several keylock switches on the HVAC panels which although not implemented on Unit 2, had been previously completed on Unit 1.
The discussion on HED's 188 and 520 previously provided for Unit I also applies to Unit 2.
Thus, for McGuire Unit 2, 33 HED modifications are planned for the 1987 and 1988 refueling outages. Three HZD modifications associated with the HVAC panels are on hold pending the results of an ongoing evaluation.
By the end of the 1988 Unit 2 refueling outage (End of Cycle 4), Duke will have implemented 98.1% of the HED modifications.
In summary, Duke is providing this status letter to demonstrate that substantial progress has been made towards implementation of all HED modifications on the previously committed schedule.
By the completion of the end of cycle 4 refueling outages on each unit, over 98% of the HED modifications will be completed.
The HED modifications associated with the HVAC panels of both units are on hold pending completion of a Duke evaluation later this year. NRC will be advised of the decision reached as a result of the evaluation.
Very truly yours,
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v Hal B. Tucker RLG/161/j gm xc:
W.T. Orders NRC Resident Inspector McGuire Nuclear Stction Dr. J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission - Region II 101 Marietta Street, NW - Suite 2900 Atlanta, GA 30323 Darl Hood, Project Manager Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
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