ML20058F571
| ML20058F571 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 12/02/1993 |
| From: | Schrage J COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| GL-84-23, GL-88-14, GL-89-13, IEB-90-001, IEB-90-1, NUDOCS 9312080182 | |
| Download: ML20058F571 (5) | |
Text
c Commonwnith Edison 6
C 1400 Opus Place Downers Grove, lilinois 60515 h
December 2,1993 t
Dr. Thomas E. Murley Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington D.C.
20555 Attn. Document Control Desk
Subject:
Quad Cities Station Unit 2 Completion of Commitments Associated with Unit 2 Cycle 12 (O2R12) Refuel Outage.
NBC Docket No. 50-265
References:
As listed in Attachment A.
Dr. Murley, On May 27,1993, Commonwealth Edison Company (CECO) returned Quad Cities Station Unit 2 to service following the unit's twelfth refuel outage (Q2R12). In the course of that outago, CECO completed actions related to various NRC commitments. This letter provides a summary of the major actions and associated commitments, in Reference (a), The NRC issued a Safety Evaluation (SER) for the Detailed Control Roo o Design Review (DCRDR) efforts at Quad Cities Station. This SER described planned DCRDR actions and the implernentation schedule for these actions. CECO requested schedular relief from the DCRDR commitments at Quad Cities Station in References (b) and (c). This relief was granted by the NRC in Reference (d). During the implementation of the DCRDR modification to the Quad Cities Unit 1 Control Room annunciator system, CECO identified and installed a potential enhancement to the modification on Unit 1. This enhancement added an annunciator alarm horn bypass switch to the annunciator system.
The key-lock bypass switch allows the Shift Engineer (SE) or Shift Centrol Room Engineer (SCRE) to temporarily bypass the annunciator alarm horns. This key-lock switch would be used when the SE or SCRE determines that the noise level, due to the number and duration of auditory alarms during a plant transient, significantly compromises verbal I
communication. This enhancement was discussed with the NRC during the Reference (d) teleconferences, and installed on Unit 2 during 02R12. The DCRDR commitments, which were described in Reference (a) and discussed in the Reference (d) teleconferences, have been completed.
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. Dr. T.E. Murley 2
December 2,1993 in Reference (f), CECO presented an operability evaluation for the 250 vDC batteries at Quad Cities Station. This operability evaluation described testing i
requirements and future enhancements to the 250 vDC batteries at Quad Cities. The NRC reviewed and approved the operability evaluation, including future enhancements in Reference (g). The enhancements described in Reference (f) included: (1) the installation of a non-Safety Related 250 vDC battery for each unit (including an associated battery charger, motor control center, cables and feeder breakers); (2) realignment of the power
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feed for the Main Turbine Emergency Bearing Oil Pump (EBOP) from the Safety Related 250 vDC battery to the non-Safety Related %ttery; and (3) realignment of the power i
feed for the RHR-Shutdown Cooling valve
(. 4 1001-47). CECO completed these enhancements during the twelf th refuel ot up, ca Unit 1 (Q1R12; see Reference (q)) and Unit 2 (Q2R12).
In Reference (h), CECO submitted a proposed schedule for completion of i
modifications related to Generic Letter (GL) 84-23, " Reactor Vessel Water Level 7
Instrumentation in BWRs" This proposed schedule was updated in Reference (i). The required modifications for Quad Cities Unit 2 were completed during Q2R12.
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In response to the requested actions of Bulletin 90-01 Supplement 1, " Loss of Fill l
Oilin Transmitters Manuf actured by Rosemount", CECO committed to replace the one category 1.c transmitter during Q2R12 (Reference (j)). This action was completed during Q2R12.
In Reference (k), CECO committed to replace the Alternate Rod Insertion (ARI)
Rosemount trip units in order to reach conformity with the NRC staff position for ARI j
System power diversity requirements described in 10 CFR 50.62. CECO provided an updated schedule for implementation in Reference (1). CECO replaced the Rosemount trip
.i units on Unit 2 during Q2R12.
l In References (m) and (n), CECO provided a response to GL 89-13 " Service Water Problems Affecting Safety Related Equipment". This response included appropriate commitments and an implementation schedule for the commitments. References (c), (p),
and (q) provided the status of GL 89-13 commitments following the eleventh refuel outage on Unit 1 (Q1R11) and Unit 2 (Q2R11), and the twelfth refuel outage on Unit 1 (01R12) respectively. The remaining GL 8913 commitments involved the completion of the RHRSW Continuous Chlorination (Biocide Modification (GL 89-13 Item 1.b)), and the test / inspection of Loop B RHRSW components (GL 89-13 ltem ll). During Q2R12, all scheduled components were successfully tested and/or inspected with one exception.
The "B" Control Room HVAC Refrigeration Unit Heat Exchanger was not inspected during Q2R12. This heat exchanger was inspected during Q2R11 for the first time since installation (1984). There was no evidence of sifting or fouling of the heat exchanger during this inspection. In addition, the cooling water lines for the heat exchanger are equipped with filters. Based upon the results of the inspection during Q2R11, and the presence of the filters, CECO has rescheduled the inspection of the "B" Control Room 1
HVAC Refrigeration Unit Heat Exchanger to the thirteenth refuel outage on Unit 2 I
(Q2R13). This outage is scheduled to begin in September 1994. The current status of the RHRSW Biocide modification is described in Attachment B.
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Dr. T.'E. Murley 3
December 2,1993 in Reference (r), CECO provided a supplemental response to Generic Letter 88-14
" Instrument Air Supply System Problems Affecting Safety Related Equipment." In that submittal, CECO provided the results of an instrument Air System Design Verification at Quad Cities Station, which was performed in 1989. In addition, CECO stated that i
additionalline walkdowns were necessary to obtain data on air line supports. CECO completed these walkdowns in 1990, and identified support enhancements for the
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instrument Air system. These enhancements were implemented on Unit 1 during Q1R12 i
(ending in December 1992) and on Unit 2 during Q2R12 (ending in May 1993). This completes all actions associated with GL 88-14.
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f If there are any further questions, please contact John L, Schrage at 708-6634 7283.
I Very truly yours, j
John. Schrage l
Nuclear Licensing Administrator
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Attachment A References Attachment B Status of RHRSW Biocide Modification i
I cc:
J. Martin, Regional Administrator-Rill l
T. Taylor, Senior Resident inspector-Ouad Cities C. Patel, Project Manager-NRR Office of Nuclear Facility Safety -IDNS I
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Attachment A l
l References l
(a)
T.M. Ross (NRC) to T.J. Kovach (CECO) letter dated April 19,1989.
(b)
J.A. Silady (CECO) to T.E. Murley (NRC) letter dated November 17,1989.
j ic)
R. Stols (CECO) to T.E. Murley (NRC) letter dated October 26,1990.
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(d)
L.N. Olshan (NRC) to T.J. Kovach (CECO) letter dated November 13,1990.
(e)
Teleconferences between NRC (C. Patel, et al) and CECO (J. Schrage, et al) on l
December 3,1992 and February 11,1993.
1 (f)
J.L. Schrage (CECO) to T. E. Murley (NRC) letter dated December 20,1991.
'l (g)
L.N. Olshan (NRC) to T.J. Kovach (CECO) letter dated January 21,1992.
l (h)
R. Stols (CECO) to T.E. Murley (NRC) letter dated August 27,1990.
(i)
J.L. Schrage (CECO) to T.E. Murley (NRC) letter dated January 10,1992.
' (j)
D. J. Chrzanowski (CECO) to T.E. Murley (NRC) letter dated March 5,1993.
(k)
D. Taylor (CECO) to USNRC letter dated March 15,1991.
(1)
J.L. Schrage (CECO) to T.E. Murley (NRC) letter dated November 13,1992.
(m)
M.H. Richter (CECO) to USNRC letter dated January 29,1990.
In)
D. Taylor (CECO) to USNRC letter dated November 14,1990.
(o)
D. Taylor (CECO) to USNRC letter dated June 28,1991.
(p)
J.L. Schrage (CECO) to T.E. Murley (NRC) letter dated July 22,1992.
(ql J.L Schrage (CECO) to T.E. Murley (NRC) letter dated February '23,1993.
(r)
D. Taylor (CECO) to USNRC letter dated November 7,1990.
Attachment B i
Status of RHRSW Biocide Modification Quad Cities Station i
Quad Cities Station is in the process of installing a biocide system that will inject a i
sodium hypochlorite and sodium bromide mixture into the RHRSW pump header. This is being installed in response to Generic Letter 89-13, item 1.b. This biocide system will mitigate any potential micro biogrowth that could occur in the RHRSW system, and should retard any potential clam or zebra musselinfestation.
The biocide system, which is common to both Unit 1 and Unit 2, will provide protection l
of both the RHRSW system and the Diesel Generator Cooling Water (DGCW) system. The j
injection point will be in the mouth of the RHRSW pump suction header in the RHRSW j
intake bay located in the Cribbouse.
The original scheduled completion date for the biocide system was prior to start-up following 02R11. Construction testing performed during 02h11 identified various sof tware/ logic and wiring problems. Because of these problems, CECO was unable to meet the original commitment date. At that time, CECO informed the Senior Resident l
Inspector (SRI) and the NRR Project Manager (PM)of the status of the modification. This l
was documented in Reference (n). CECO also committed to provide periodic status l
updates to the SRI and inform the PM upon completion of the modification.
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Subsequent to 02R11, CECO resolved the sof tware/ logic and wiring problems. However, additional mechanical problems were encountered with respect to the discharge relief-valves and the pump under-capacity. The under-capacity problem has since been
.j resolved, and the discharge relief valves have been replaced with rupture disks. CECO is currently completing administrative preparations necessary for modification testing.
l When these are completed, CECO will perform the required modification and operability j
tests necessary to authorize the system for operation. CECO willinform the PM upon completion of these actions.
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