ML18153C208
| ML18153C208 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/30/1990 |
| From: | Buckley B Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9005030358 | |
| Download: ML18153C208 (22) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 April 30, 1990 Docket Nos. 50-280 and 50-281 LICENSEE:
Virginia Electric and Power Company FACILITY:
Surry Power Station, Units 1 & 2
SUBJECT:
MEETING
SUMMARY
OF APRIL 11, 1990 A meeting was held with representatives of the Virginia Electric and Power Company (VEPCO) in Rockville, Maryland on April 11, 1990.
The purpose of the meeting was to discuss modifications to the Main Cont ro 1 Room and Emergency Switchgear/Relay Room (MCR and ESGR) Air Conditioning System.
Meeting handouts and a list of attendees are enclosed.
The MCR and ESGR Air Conditioning System is a shared system that cools the Surry Unit 1 and Unit 2 main control rooms, emergency switchgear rooms, and relay rooms.
The MCR and ESGR system was originally designed to consist of one operating full capacity air conditioning train and one full capacity back-up air conditioning train.
Based on the results of tests conducted in 1989, VEPCO concluded that each air conditioning train would not provide the required 100 percent heat rerroval capacity.
Each train contains one chiller refrigeration unit and four air handling units (AHUs) - a dedicated AHU for each of the areas served, i.e., the Unit 1 MCR, Unit 2 MCR, Unit I ESGR, and Unit 2 ESGR.
A third chiller is provided as a maintenance swing chiller.
To maintain the design basis room telll)eratures, interim modifications were i~lemented and an interim amendment to the Unit 1 and 2 Technical Specifications was issued in May 1989 to allow restart of both units until perlTil.nent modifications could be made, i.e., replacement of the MCR and ESGR AHUs and the three chillers with larger capacity units.
As stated above, it was VEPCO's intent to replace all three degraded chillers (which will be rated at 50 percent of original capacity after the larger AHUs are installed) with three 100 percent capacity chillers.
The existing chi l1er system requires all three chillers to be operable and would not allow one chiller to be taken out of service for a period greater than 7 days without shutting down the plants.
Moreover, a 24-hour fire watch is presently being maintained because all three chillers are located in one room.
Therefore, a new chiller is needed to allow operational flexibility.
During the meeting, VEPCO addressed various conceptual design approaches they considered (see handouts for further details) before concluding in January 1990 that replacement of the degraded chillers with three larger chillers was not feasible or practical.
Replacing the three existing chillers with three larger units would involve extensive structural rrodifications and interruption of plant activities since the units are too large to be located in the present chiller room.
Consequently, VEPCO proposed to retain the existing 50 percent chillers and install one additional 100 percent capacity safety-related chiller in the turbine building.
Receipt of the larger chiller is anticipated in June or July 1991.
The new chiller would be connected to new service water piping that will be installed
'~ I April 30, 1990 and capped off during the upcoming refueling outages.
The new chiller will be housed in a seismic Class I structure.
However, no firm dates have been estab 1 ished at this time as to when the new chiller wi 11 be dee la red operable or when the seismic Class 1 structure wi 11 be COrll)leted.
In addition to the above activities, VEPCO will replace all eight MCR and ESGR AHUs with eight larger units during the upcoming refueling outages.
Implementation of the above modifications will require interim IIDdifications to the Technical Specifications (TS) to permit removal of components and completion of the above activities.
The exact wording of the interim TS are being developed by VEPCO and are expected to be submitted within the next 6 to 8 weeks.
Based on VEPC0 1 s presentation, the NRC staff at this time finds VEPC0 1 s design approach to be acceptable.
Further meetings, if necessary, will be held upon receipt of VEPCO I s submittal.
Enclosures:
I. Meeting Handouts
- 2.
List of Attendees cc w/enclosures:
See next page DISTRIBUTION:
Docket Fi le S. Varga NRC & Local PDRs G. Lainas F. Miraglia PD22 Rdg. Fi le H. Berkow B. Bue kley OGC E. Jordan NRC Participants ACRS ( 10)
R. Borchardt 17621 D. Miller Original Signed By Ba rt C. Buckley, Project Manager Project Di recto rate II-2 Division of Reactor Projects - I/II cc:
Licensee/Applicant & Service List OFC---~~~~-2-------~PM:P~.i)..... ___ ~D:P~~----~--------------~--------------~-------------
NAME
- D~q,'Ei'r}
- BBuck~
- HBea;,-~y DATE
~4/ '790
~4/1-S/90
~4/:.,o/90 OFFICIAL RECORD COPY Document Name:
SUMMARY
Virginia Electric and Power Company cc:
Michael W. Maupin, Esq.
Hunton and Wi11iams Post Office Box 1535 Richnxrnd, Virginia 23212 Mr. Michael R. Kansler, Manager Surry P<Mer Station Post Office Box 315 Surry, Virginia 23883 Senior Resident In specter Surry Power Stat i on U.S. Nuclear Regulatory Commission Post Office Box 166, Route 1 Surry, Virginia 23883 Mr. Sherlock Hol11Es, Chairman Board of supervisors of Surry County Surry County Courthouse Surry, Virginia 23683 Mr. W. T. Lough Virginia Corporation Commission Division of Energy Regulation Po st Office Box 119 7 Richmond, Virginia 23209 Regional Administrator, Region II U.S. Nuclear Regulatory Conmi ssion 101 Marietta Street NJi., Suite 2900 Atlanta, Georgia 30323 C. M. G. Buttery, M.D., M.P.H.
Depart11Ent of Health 109 Governor Street Richmond, Virginia 23219 Surry Power Station Attorney General Su pre me Court Building 101 North 8th Street Richroond, Virginia 23219 Mr. E. Wayne Harrell Vice President - Nuclear Operations Virginia Electric and Power Company 5000 Old Dominion Blvd.
Glen Allen, Virginia 23060 Mr. J. P. O'Hanlon Vice President - Nuclear Services Virginia Electric and Power Company 50 0 0 0 l d Do mi n i on B 1 v d.
Glen Allen, Virginia 23060
'Mr. R. F. Saunders Manager - Nuclear Licensing Virginia Electric and Power Company 5000 Old Dominion Blvd.
Glen Allen, Virginia 23060 Mr. W. L. Stewart Senior Vice President - tllclear Vi rgi ni a Electric and Power Company 5000 Dominion Blvd.
Glen Allen, Vi rg i ni a 23060
Name Ba rt Buckley Dave Sommers Bill Corbin R. F. Saunders George Nash, Jr.
E. S. Grecheck E.T. Shaub Albert B. Ruff Darrell Roberts N.K. Trehan C. Hsu Charles R. Nichols Bi 11 LeFave Herb Ber kow John Knox Sai P. Chan Attendance Li st Surry Mtg of 4/11/90 on Chiller Mods Affi 1.
NRC/NRR/PD2-2 ENCLOSURE 2 Va. PCM er -Su pv Li cen sing Va. Power-Supv-Nc Engr. -Proj.
Va. Power Mgr Li c.
Va. Power-Project Engineer Va. Power-Asst. Sta Mgr-Surry Va. Power-Licensing NRC, Region II, Project Engr.
NRC/NRR/DST /SPLB NRC/NRR/DST /SELB ROAB/AEOD/NRC NRC/NRR/DST /SPLB NRC/NRR/DS T /SP LB NRC /NRR/PD II-2 NRC/NRR/DST /SELB NRC/NRR/DET /ESGB
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PURPOSE 0
TO PRESENT ISSUES PERTAINING TO RESOLUTION OF THE CONTROL ROOM AND EMERGENCY SWITCHGEAR ROOM HVAC UPGRADE PROJECT.
0 TO OUTLINE ACTIVITIES PERFORMED AND PROGRESS MADE.
0 TO PRESENT PLANNED DESIGN CONCEPT AND IMPLEMENTATION.
h134-GLN-457-1 ENCLOSURE 1
OVERVIEW 0
CHRONOLOGY OF EVENTS UP TO INTERIM CONFIGURATION 0
DISCUSSION OF LONG TERM CORRECTIVE ACTION ISSUES 0
CONCEPTUAL DESIGN IMPLEMENTATION ISSUES 0
FINAL DESIGN IMPLEMENTATION h134-GLN-457-2
e CHRONOLOGY OF EVENTS UP TO INTERIM CONFIGURATION 0
ORIGINAL DESIGN 0
KEY DESIGN FEATURES 0
POTENTIAL SYSTEM INADEQUACY 0
SHORT TERM RESOLUTION OF ISSUE h134-GLN-457-3 TESTING INTERIM MODIFICATIONS KEY DESIGN FEATURES TECH SPEC. REVISION PERFORMANCE OF SYSTEM TODAY
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UNIT 2 CR. 8 UNIT 2 C.R. 0 2-VS-AC-9 2-VS-AC-8 AHU'S UNIT 1 C.R.
UNIT 1 C.R. 0 1-VS-AC-1 1-VS-AC-2 UNIT 2 ESR
~H
~--v UN_IT_l _ES_R_ 0 2-VS-AC-7 UNIT 1 ESR 1-VS-AC-7 Q
I MAINTENANCE CHILLER I I
I I
1-VS-AC-UNIT 2 ESR 2-VS-AC-6 Q
V 1-VS-E-4A Q
Q 1-VS-E-48
~
1-VS-E-4C 100%
NOTES:
@=POWER SUPPLY CAD/I 01039\\0810\\WPB\\ FIG1 I
I I
J 100%
I I
I I
I I
I I
I I
1-VS-P-28 L ________ _J CHILLED WATER PUMPS 100%
SCHEMA TIC DIAGRAM CONTROL ROOM & RELAY ROOM CHILLED WATER SYSTEM (ORIGINAL)
FIGURE 1
KEY DESIGN FEATURES ORIGINAL SYSTEM 0
MAINTAIN MCR AND ESGR WITHIN BULK TEMPERATURE LIMITS MCR -
75°F NORMAL, 75°F ACCIDENT ESGR -
80°F NORMAL, 87°F ACCIDENT 0
TWO SEPARATE 100% CAPACITY AIR CONDITIONING TRAINS 0
MAINTENANCE CHILLER (100% CAPACITY) ALLOWS EITHER CHILLER 4A OR 4C TO BE TAKEN OUT OF SERVICE WITH NO TIME LIMIT 0
REDUNDANT TRAINS PROVIDED WITH SEPARATE EMERGENCY POWER SOURCES 0
MAINTENANCE CHILLER/AUXILIARIES PROVIDED WITH ALTERNATE EMERGENCY POWER SOURCE h134-GLN-457-4
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e SYSTEM INADEQUACIES 0
ESGR DESIGN ACCIDENT HEAT LOAD GREATER THAN DESIGN
ESGR + MCR DBA HEAT LOAD GREATER THAN SINGLE CHILLER CAPACITY 0
CAUSE ADDITIONAL HEAT LOADS ADDED TO SPACE ENVELOPE h134-GLN-457-5
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SHORT TERM RESOLUTION OF ISSUE 0
TESTING ESTABLISHMENT OF CURRENT DESIGN BASIS HEAT LOAD 0
INTERIM MODIFICATIONS 0
MECHANICAL 3/3 CHILLERS OPERABLE 4/4 ESGR AHU'S INCREASE FAN SPEEDS MINOR DUCT MODIFICATIONS AHU INLET DAMPERS DECOUPLED FROM OPERATIONS
<LOCK OPEN)
CHILLED WATER TCV'S DECOUPLED FROM OPERATIONS
<LOCK OPEN) 0 ELECTRICAL hl34-GLN-457-6 H/J POWER TO 4/4 ESGR AHU'S 2 MOTORS PER AHU 2 SETS SHEAVES/BELTS PER AHU LOCAL SELECTOR SWITCH 1J/2J POWER TO ~B~ CHILLER & AUXILIARIES MANUAL POWER TRANSFER SWITCH
UNIT 2 C.R.*@
I 2 C.R.
2-VS-AC-9 2-VS-AC-8 AHU'S UNIT 1 C.R.
UNIT 1 C.R.
1-VS-AC-1 1-VS-AC-2 UNIT 2 ESR ~
G)
UNIT 1 ESR ~
G 2-VS-AC-7 1-VS-AC-6 UNIT 1 ESR ~
UNIT 2 ESR ~
G)
G 1-VS-AC-7 2-VS-AC-6 CHILLERS Q
1Jx
~
V 1-VS-E-4A
/@ 1-VS-E-4B
\\;:J 1-VS-E-4C 50%
NOTES:
@=POWER SUPPLY CAD# 01039\\0810\\WPB\\ FIG2 50%
50%
1-VS-P-2B CHILLED WATER PUMPS SCHEMA TIC DIAGRAM CONTROL ROOM & RELAY ROOM CHILLED WATER SYSTEM (INTERIM) 1-VS-P-2C FIGURE 2
e KEY DESIGN FEATURES INTERIM MODIFICATIONS 0
REDUNDANT FAN MOTORS AND ELECTRICAL POWER SOURCES PROVIDED FOR ESR AHUs.
0 REDUNDANT POWER SUPPLY PROVIDED FOR SWING CHILLER l-VS-E-4B.
0 TO MEET DESIGN HEAT LOADS 2 CHILLERS SUPPLY 2 AHU TRAINS h134-GLN-457-9
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TECH SPEC REVISIONS 3/3 CHILLERS OPERABLE (7-DAY 1/3)
UNITS 1 & 2 AHU'S (ABOVE COLD SHUTDOWN) 2/2 MCR OPERABLE (7 DAY 1/2)/HOT SHUTDOWN 6 HRS/COLD SHUTDOWN 30 HOURS 2/2 ESGR OPERABLE HOT SHUTDOWN 6 HRS/COLD SHUTDOWN/30 HOURS UNIT 1 & 2 ESGR AHU DRIVE MOTORS 4/4 OPERABLE (7 DAY 1/4) / HOT SHUTDOWN 6 HRS/
COLD SHUTDOWN 30 HOURS ADDITIONAL ADMINISTRATIVE PROCEDURES AT COLD SHUTDOWN 0
PERFORMANCE OF SYSTEM TODAY hl34-GLN-457-8 SINCE SERVICE WATER PROJECT (ENLARGED PIPE SIZES, VENTING) SYSTEM HAS RUN SMOOTHLY
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CONCEPTUAL DESIGN IMPLEMENTATION ISSUES 0
FIXED PARAMETERS 2 - 100% AIR CONDITIONING TRAINS, CREDIBLE SINGLE FAILURE DESIGN TEMPERATURE DESIGN HEAT LOAD NUMBER OF AIR HANDLING UNITS AND SPACE ENVELOPE DUCTWORK CHILLED WATER FLUID MEDIUM SERVICE WATER COOLED 0
VARIABLE PARAMETERS CHILLERS (NUMBER, SIZE)
CHILLED WATER TEMP.
CHILLER LOCATION 0
OPTIONS CHOSEN (TO SUPPORT LONG LEAD PROCUREMENT) 40°F CHILLED WATER TEMPERATURE 3-100% CHILLERS 8-100% AHUS SIZED FOR 40°F WATER IN hl34-GLN-457-10
- 'J'*
e 0
CHILLER LOCATION h134-GLN-457-11 MER-3 NEW CHILLERS ARE LARGER 3 CHILLERS IN ONE SPACE DO NOT SATISFY APPENDIX R NO SAFETY RELATED CHILLER WATER FOR DURATION OF MODIFICATION MER-5 (ANNEX-ANNEX)
CLOSE PROXIMITY INSTALL 2 NON-OUTAGE 30% DESIGN CHEM LAB, COUNT ROOM DISRUPTIONS SERVICE WATER PUMPING ISSUES MER-5 (EAST OF MER-3)
SCHEDULE JUNE 1992 UNCERTAINTIES OF EXCAVATION
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UNIT 2 C.R.
UNIT 2 C.R.
2-VS-AC-9 2-VS-AC-8 AHU'S UNIT 1 C.R.
UNIT 1 C.R.
1-VS-AC-1 1-VS-AC-2 UNIT 2 ESR UNIT 1 ESR 2-VS-AC-7 1-VS-AC-6 UNIT 1 ESR UNIT 2 ESR 1-VS-AC-7 2-VS-AC-6 CHILLERS Q
1Jk
~
V 1-VS-E-4A
/@ 1-VS-E-46 V
1-VS-E-4C 50%
NOTES:
@=POWER SUPPLY CAD/I 01039\\0810\\WPB\\ FIG3 50%
50%
1-VS-P-28 CHILLED WATER PUMPS SCHEMA TIC DIAGRAM SYSTEM CONFIGURATION AT COMPLETION OF UNIT_ 2 OUTAGE
§
§ FIGURE J
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KEY DESIGN FEATURES SYSTEM CONFIGURATION AT COMPLETION OF UNIT 2 OUTAGE 0
NEW 100 CAPACITY AHUs RESTORE REDUNDANCY OF ORIGINAL SYSTEM.
ONLY ONE GROUP OF AHUs IS REQUIRED FOR NORMAL AND ACCIDENT HEAT LOADS.
0 MAXIMUM OPERATIONAL FLEXIBILITY TO ALLOW CHILLERS TO SUPPLY EITHER GROUP OF AHUs.
0 THREE CHILLERS MUST BE OPERABLE WHENEVER EITHER UNIT IS ABOVE COLD SHUTDOWN.
0 1J/2J POWER SUPPLY PROVIDED FOR SWING CHILLER -1VS-E-4B.
h134-GLN-Li57-12
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PLANNED DESIGN IMPLEMENTATION 0
THREE-STEP IMPLEMENTATION PROCESS UNIT I OUTAGE UNIT 2 OUTAGE NON-OUTAGE 0
REPLACEMENT OF UNIT I AHU'S UNIT I 1990 OUTAGE PERFORM CHILLED WATER/SERVICE WATER TIE-INS INTERIM TEMPORARY POWER SUPPLY TO MCR AHU 0
REPLACEMENT OF UNIT 2 AHUs UNIT 2 1991 OUTAGE INTERIM TEMPORARY POWER SUPPLY TO MCR AHUs h134-GLN-457-13
- -r'*
i I
UrJIT 2 c~
/ _*1 2-VS-AC-9 I
UNIT 1 C.R.
I 1-VS-AC-1 UNIT 2 ESR 2-VS-AC-7 UNIT 1 ESR 1-VS-AC-7 Q
V 1-VS-E-4A 50%
NOTES:
@=POWER SUPPLY CAD# 01049\\0810\\WPB\\ FIG4
@ e AHU'S CHILLERS Q
1*
2J 1-VS-E-48
~
1-VS-E-4C 50%
50%
1-VS-P-28 1-VS-P-2C CHILLED WATER PUMPS SCHEMA TIC DIAGRAM CONTROL ROOM & RELAY ROOM CHILLED WATER SYSTEM (FINAL)
UNIT 2 C~
§ 2-VS-AC-8 UNIT 1 C.R.
§ I
1-VS-t..C-2 I
UNIT 1 ESR
§ 1-VS-AC-6 UNIT 2 ESR 2-VS-AC-6
- 1.
1-VS-E-4D 100%
1-VS-P-2D FIGURE 4
KEY DESIGN FEATURES PLANNED SYSTEM CONFIGURATION 0
TWO 100% CAPACITY AIR CONDITIONING TRAINS 0
NEW 100% CAPACITY AHUs RESTORE REDUNDANCY OF ORIGINAL SYSTEM.
ONLY ONE GROUP OF AHUs REQUIRED FOR NORMAL AND ACCIDENT HEAT LOADS.
0 MAXIMUM OPERATIONAL FLEXIBILITY TO ALLOW CHILLERS TO SUPPLY EITHER GROUP OF AHUs.
0 CHILLER/AHU EMERGENCY POWER SOURCES PROVIDE FOR SINGLE FAILURE.
hl34-GLN-457-14
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FINAL DESIGN IMPLEMENTATION 0
ADDITION OF NEW CHILLER LOCATED IN TURBINE BUILDING 0
NON-OUTAGE WORK 0
RESTORES OPERATIONAL FLEXIBILITY 0
SATISFIES APPENDIX R ISSUES
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h134-GLN-457-15