ML20045D665
| ML20045D665 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 06/21/1993 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-M68510, TAC-M68511, NUDOCS 9306290278 | |
| Download: ML20045D665 (9) | |
Text
.
aver Valley Power Station Shippingport, PA 15077-0004 4
JOHN D. SIEBER (412) 393-5255 l
Senior Vice President and Fax (412) 643-8069 Chief Nuclear Officer Nuclear Power Division June 21, 1993.
U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, DC 20555~
l
Subject:
-Beaver Valley Power Station, Unit Nos. 1 & 2 Docket No. 50-334, License No. DPR-66 Docket No. 50-412, License No. NPF-73 l
Station Blackout (TAC Nos. 68510-andi68511) l The NRC' Safety Evaluation Report'(SER)~for Station Blackout (SBO) dated November 23,
- 1990, concluded that_the Duquesne. Light Company (DLC)' methodology for dealing. with an:SBO event is in conformance j
with 10 CFR 50.63,.and that DLC :is tol notify the Commission in l
writing upon completion of hardware and procedure modifications.
DLC l
has completed all actions related. to SBO.
The Alternate AC (AAC) electrical cross-tie modifications have been installed, tested and-declared operational.
Operator-training was conducted on the j.
applicab.Le Emergency Operating Procedures (EOrs) for both Units 1 and 2,
and the EOPs were issued.
A summary of.the testing program-for the AAC power source capability is provided in' Enclosure 1.
During implementation of the training phase-of the station blackout
- EOPs, concerns. were raised over.the appropriateness of closing certain containment isolation ' valves (CIVs).
The actions were determined to be in-conflict with the symptom based EOPs and could make certain safety systems unavailable.
Our review also indicated that criteria was being applied by'the-industry in addition to those previously identified in NUMARC 87-00.(Section 7.2.5)' for Enclosure #2, " Containment
. exclusion of CIVs during SBO events..
more detail concerning the Integrity During SBO Events,"
provides safety implications.and l delineates-the relevant exclusion criteria-and provisions-
.provided' for. closure' capability.. for. the CIVs identified in the SER for'SBO dated November 23,- 1990.
k80008
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0 ELECTRK UTILITYof 9306290278 930621 9
I THE YEAR PDR ADOCK 05000334' h
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P PDR
Bbcvtr Velley Powar Station, Unit Nos. 1 & 2 Docket No. 50-334, License No. DPR-66 Docket No. 50-412, License No. NPF-73 Station Blackout (TAC Nos. 68510 and 68511)
Page 2 The Emergency Diesel Generator (EDG) electrical load list (Table 8.5-1) for the Unit 1 UFSAR is being updated.
The changes have been reviewed and incorporated into our SBO load list.
The
- results, presented in Enclosure 3 (Tables 1 and 2), indicate that the
)
required SBO loads for the Unit 1 and Unit 2 EDGs are acceptable in comparison to the previously recorded values in our load list submittal of July 27, 1990, and reflected in our SER for SBO dated November 23, 1990.
Our original load list for. Unit 1 (Table 1)-
identified a
total load of 2764.8 kW (1 to 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> duration).
The revised load list for Unit 1 shows the maximum load at 2746.8 kW.
Our original load list for Unit'2 (Table 2) identifir.d a total load of 4308.0 kW (1
to 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> duration), and our revisec'. load list for Unit 2 shows a maximum load of 4320.3 kW.
The increase in the Unit 2 load list was due to the transformer load losses at the-blacked-out unit and additional loads identified during the procedure development stage.
The loads originally listed for the Unit 1 and Unit ~2 Control Rod Drive Mechanism Shroud Cooling Fans were determined not to be required and eliminated from consideration at the blacked out unit based on our existing EOPs for a loss of offsite power event.
Future design changes to the EDG loading will be reviewed for its impact on SBO and evaluated under the provisions of 10 CFR 50.59.
If there are any questions concerning this response please contact Mr. John J. Maracek at (412) 393-5232.
Sincerely, J.
D.
Sieber Enclosures cc:
Mr. L. W. Rossbach, Sr. Resident Inspector Mr. T. T. Martin, NRC Region I Administrator Mr. G.
E.
Edison, Project Manager Mr. M. L. Bowling (VEPCO).
=
ENCLOSURE #1 Page 1 of 1
SUMMARY
OF TESTING PROGRAM FOR AAC CROSS-TIE POWER SOURCE The NRC's Station Blackout Safety Evaluation Report for BVPS Unit 1 and 2,
dated November 23,
- 1990, included the following recommendation:
DLC should conduct the appropr3?te AAC tests in accordance with the guidance of NUMARC 87-G' Appendix.
B, Item B.12 to demonstrate that it can be brought on line within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
NUMARC R7-00 Appendix B, Criteria B.12 states:
Unless otherwise governed by technical specifications, the AAC system shall be demonstrated by initial test to be capable of powering required shutdown equipment within one hour'of a station blackout event.
To satisfy the above, the following tests were performed:
A timed test was conducted as part of the validation and verification of the procedures for SBO at BVPS Unit 1 and BVPS Unit 2 to verify all actions required for establishing the AAC cross-tie power source could be accomplished within one hour.
The four new 4kV breakers installed as part of the AAC cross-tie power source were factory tested per the requirements of the American National Standards Institute, ANSI C37.09.
This testing included electrical resistance of current path tests that verified conductivity of each circuit breaker-pole at 200 amps test current.
The breakers were mechanically bench-tested and functionally proof-testad.
The AAC cross-tie cable is-. conservatively sized for the i
required loads, fully qualified to IEEE 383 and IEEE 323 for Class 1E applications, DC high-pot tested to 30,000 VDC, and all connections were meggar tested and phase checked at rated voltage.
The AAC cross-tie was operationally tested with an energized load (approximately 35 amps) to verify'the integrity of the power cable and the ability to transfer power between units.
The voltage drop across the SBO' cross-tie was measured while loaded and determined to be within design limits.
Based on the integrated testing program performed on the'AAC cross-tie power source capability, there is reasonable assurance that the hardware and software modifications implemented for SBO at'BVPS_ Unit 1 and 2 meet'all regulatory and design requirements.
.~
ENCLOSURE #2 Page 1.of'2 i
CONTAINMENT INTEGRITY DURING SBO EVENTS l
NRC Safety Evaluation Report for
- SBO, dated November 23, 1990, identified certain containment. isolation valves (CIVs):that;would require closure capability to
. ensure. appropriateL containment integrity during a station blackout (SBO) event:
VALVES STATUS / FAIL SIZE UNIT RSS-MOV 155A&B OPEN/AS IS:
12" 1/2 RSS-MOV 155C&D OPEN/AS IS
.12" 2
CHS-MOV 381 OPEN/AS IS 3"
1/2 IAC-MOV 134 OPEN/AS IS 4"
2 Our response' dated December 20' 1990, was as follows.
"The SBO procedure will'l include provisions for proper-control of. these valves to ensure containment integrity, as required.
It is not anticipated' that theLsubject valves noted in the SER will need'to be actuated because of a
station blackout,.however, the valves -have the.
capability for manual closure with position indicat' ion,.
independent of the blacked-out unit's power supplies,.in the event containment integrity. is frequired-under SBO-
-i conditions.
The procedure development will coincide with the SBO modification work for the Alternate AC cross-tie."
j r
During the SBO EOP procedural 1 development and training phase, our 1
operations staff raised concerns over the appropriateness of closing.
the.
recirculation spray' pump'
-suction.
isolation ~
valves (RSS-MOV-155A&B) 'at BVPS, Unit 1
and the recirculation: spray pump outside. containment suction isolation' valves (2RSS*MOV-155A,EB,;C, &
D) at BVPS Unit 2..
The closure of these valves.would render the containment depressurization-safety systems unavailable in the event of a-Containment. Isolation ~: Phase-B (CIB) signal.during.a? loss of coolant accident (LOCA).
Additional _ exclusion criteria by the NRC' staff was'recently noted for
+
other facilities in. the industry: for demonstrating ~' containment
' integrity during an 'SBO ' event..
In addition. to theE criteria
' established in!.Section 7.2.5 of NUMARC.87-00, the.provisionsiof ANS Standard ANS-56.2/N271-1976.. may talso: be-' applied;for demonstrating i
containment integrity' during, an SBO. event..
min _.particular, the following generic. criterion Lis also being~ utilized for exclusion'of.
CIVs:
u..
ENCLOSURE #2 Page 2 of 2 CONTAINMENT INTEGRITY DURING SBO EVENTS (Continued) l Valves in radioactive closed loops that are not expected l
to be breached during a station blackout provided these l
loops (a) connect directly to the suppression pool, (b) are provided with a single isolation valve, (c) are always submerged thereby preventing the escape of containment l
atmosphere, and (d) where the piping outside containment constitutes a. closed system providing a second isolation barrier following a single active failure.
l This exclusion criterion would apply to the recirculation spray pump suction isolation valves (RSS-MOV-155A&B) at BVPS Unit 1 and the recirculation spray pump outside containment suction isolation valves l
(2 RSS *MOV-155A,
B, C
D) at BVPS Unit 2.
.Both systems are closed loop systems that take suction from the containment sump and are not expected to be breached during a station blackout event.
The closure of these valves raised concerns over the appropriateness of actions that could make safety systems unavailable and potentially create conflicts with our symptom based Emergency Operating Procedures (EOPs).
l Because of the safety implications and because a basis for the change does
- exist, the commitment made to provide provisions for closure capability for the recirculation spray pump-containment suction isolation valves during an SBO event has been modified as allowed under 10 CFR 50.59.
Closure capability has been addressed procedurally.in the EOPs for the seal water return containment isolation valves (MOV-1CH-381) at BVPS Unit 1
and (2CHS*MOV-381) at BVPS Unit 2.
These CIVs will be manually closed to isolate reactor coolant pump seal water return for a
loss of offsite power event.
Closure capability has been provided for containment instrument air suction valve (2IAC*MOV-134) for BVPS Unit 2 from the AAC power source and is procedurally addressed in the EOPs.
1
1 1
ENCIOSWE 3
^
' DUKE 1
)
(Davire!: June 15, 1993)
ALTER 9fLE AC IDAD MANAGBENP SCIIEMB RR BFAVER VArm
('Ibtal Inarkt on thit 1 EDG) j l
LNIT 1 INIT 2 IDADS (kW)
IDADS (kW)
CDMPONINT NB0 INIT BO INIT REMARKS O to I hour to After 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to I hour 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> (2nrging-Hi Head Safety
+ Discretionary Iniection Pune 457.9 457.9 457.9
(+)
Load River Water Puno 356.8 356.8 356.8-(+)
+ Cruts-tie RRS Steam Generator AIV Pune 299.4 299.4 299.4 RHR P2no
- O 224.1 224.1
- 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> delav Primary Plant Conpanent Coolim Water Pumo 282.0 282.0 282.0 Turbine Bearing Oil Lift Pune 13.3 13.3 13.3 Motor Operated Valves
++ Misc. M 's and Dcwaxrs (Total) 32.5 0.0 0.0
(++)
at BO Unit hytacf Diesel Au.xiliaries 33.6 17.8 17.8 Turbine Generator Bearina Inbe Oil Pune 31.4 31.4 31.4
'Iurbine Turning Gear I
I Drive Motor 22.0 22.0 22.0 Pressurizer Heaters **
0.0 270.0 270.0
- 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> delav Boric Acid Transfer Pune 12.8 12.8 12.8 Boric Acid Tank Heaters 22.2 22.2 22.2 Battery Chamers 22.2 22.2 22.2-14.6 Transformer losses 27.5 27.5 27.5 Enkaytacf Lighting Supolemental ('Ibtal) 19.5 19.5 19.5 Control Rocxn Air Supolv Fans 44.3 44.3 44.3 Control Room Air Return Fans 33.3 33.3 33.3 Control Rocan AC Consa t:ssvu 56.3 56.3 56.3 Cbntrol Rocan AC Condenser Circulatirg Pumos 4.5 4.5
-4.5 Isak Collection Exhaust Fans 106.7 0
0 Safeguards Area Sumt Puno 4.5 4.5 4.5' Enmaytucf Swgr &
'Battely Room Exhaust Fan 9.6 9.6 9.6
- - RHR Punps; time delay of > 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> per'UFSAR.
- Intermittent Ioad;. Pressurizer heaters to be de-energized when starting discretionary
. load ' (charging punp) at BV-2. =.To be s ucstarally addressed.
++ M loads at the Bo Unit are short term (max. '3 minutes) and only one M at a time-.is operated. 'Ihe M' loads are a*ated in the IDG margin.
l l
ENGOEKRE 3
' DELE 1 (Cont'd) i (Revised: June 15, 1993) l ALTERNKIE AC IDAD K40GBENT SOHME RR BERVER VATN I
(Total Innrh cri Unit 1 EDG) -
l INIT 1 INIT 2 1 DADS (kW)
IDADS (kW) 3 COMMNENT NB0 INTP B0 INTf RD9FS l
1 O to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to After 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 4 hours 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours Emergency Swgr &
L Battery Room l
Supolv Fan 13.9 13.9 13.9 Riel Pool Coolira Pumo 18.6 0.0 18.6 Control Eod Coolim Fan 95.2 95.2 95.2 Miscellaneous Fans and pmm 12.9 12.9 12.9 Boron Injection Recirc pmm 15.6 15.6 15.6 Cooling 'Ibwer Warnim Liahts 2.4 2.4 2.4 i
Pipe Heat Tracing (Total) 116.7 116.7 116.7 Vital Bus loads 27.3 27.3 27.3 Mi e llaneous Heaters L
(Total) 45.7 45.7 45.7' Emtu.yvicy AC Distribution Panels 31.8 31.8 31.8-1 Containment Instr.
Air Comoressor 18.6 0.0 0.0 Camputer Inverter 17.7 17.7 17.7 48 Volt Batterv Q1aruer 2.4 2.4 2.4-Additional SB0 Icads for BO Unit j
Control Room INAC
]
[
Unit (BV-21 27.4 Fan Oniv i
l Ioad & Cooling System Losses AC Dist. Transf.
49.0 t
AC Dist. Transf. (E-3) 3.1 l
AC Dist. Transf. (E-9) 0.6 AC Dist. Transf. (E-1) 5.1 Vital Bus Rect. 2-3 8.8 Vital Bus Rect. 2-1 14.0 Battery Rocra l
Exhaust Fan 6.2 AC Distr. xmfr (E-7) 2.9 AC Distr. xmfr (E-11) 2.1
'IUPAL IDADS 2311.1 2613.0 2631.6 133.8
'IUIAL IDADS ON INIT 1 EDG
'2311.1 2746.8*
2631.6 NOTE: Diesel generator.2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating = 2850 kW. (Ref. UFSAR-1, Fig. 8.1-1).
- Max Ioad for NB0 and B0 Units (total) during SB0 = 2746.8 kW.
i e
EN3OEARE 3 l
j
'DUILE 2 i
(Revisod: June 15, 1993)
AIIIENATE AC IDAD MANAGEMENP SQDIE FCR BFAVER VATM
("Ibtal Icads on Ihit 2 EDG)
INIT 2 UNIT 1 IDADS (kW)
IDADS (kW) l 00MKNDU' NBO UNIT BO UNIT REMARKS l
0 to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to After 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to i
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 4 hours 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours l
01arging-Hi Head Safety Iniection Pump 477.0 477.0 477.0 457.9 Service Water Pumo 696.0 696.0 696.0 l
Pump 320.0 320.0 320.0 RHR Pump
- 0.0 241.0 241.0
- 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> delav Primary Plant Ocmponent Coolirn Water Pump 316.0 316.0 316.0 leak Coll. Filter Exch. Fans 150.0 150.0 150.0 Emerg. Swgr.
Supolv Fans 50.4 50.4 50.4 Emerg. Swgr.
I Exhaust Fans 44.9 44.9 44.9 Main Steam Fans 62.0 62.0 62.0 Cont. Air Recirc. Fans 154.0 0.0 0.0 Isak Sys. Elec. Htr.
211.0 211.0 211.0 Przr. Heaters **
0.0 270.0 270.0
- 1 Hour Delav CRIN Shroud Pan 56.0 56.0 56.0 Icad & Clg. Sys.
Iosses (XFMR) 49.0 49.0 49.0 27.5 AC Dist. Transf. (E-5) 0.3 0.3 0.3 SWP Inbe Water strainer 0.5 0.5 0.5 Intake Surolv Fan 4.1 4.1 4.1 AC Dist. Transf. (E-3) 3.1 3.1 3.1 Control Roam AC Unit 27.4 27.4 27.4 Refrict. Cond. Unit 50.0 50.0 50.0 AC Dist. Transf. (E-9) 0.6 0.6 0.6 Elect. Heat Xfmr.
2.1 2.1 2.1 Motor Operated 4+ Misc. HOV's Valves (Total) 110.6 0.0 0.0
(++)
at Bo Unit Fbel Pool Coolirn Pump 14.4 0.0 14.4 Cbnt. Bldg. Air Exch, and Supolv Fan 25.0 25.0 25.0 Chg. Pump Cub.
Exch. Fan 18.0 18.0 18.0 AC Dist. Transf. (E-1) 5.1 5.1 5.1 MCC Cub. Exch. Fan 2.8 2.8 2.8 DG Fuel Oil Xfr. Pumps 0.7 0.7 0.7 DG Bldg. Supply Fan (270A) 33.0 33.0 33.0 DG Crank Case Vacuum Pump 1.1 1.1 1.1 o
RHR Pumps; Time Delay of > 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> per UFSAR.
on Intermittent Icad.
++ IOV loads at the BO Unit are short term (max. 3 minutes) cnd only one MJV at a time is operated. 'Ihe M]V loads are arv-v%ted in the EDG margin.
ENCIDSlRE 3 4
TABm 2 (Cont'd)
(Revised: June 15, 1993)
AumaoGE JC IDAD MANAGBENf SCMME PN BERVE VAUM
('Ibtal Irswh ort Iktit 2 EDG)
INIT 2 INIT 1 IDADS (kW)
IDADS (kW)
COMPONENT NB0 INIT DO INIT RDiARKS O to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to After 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to I hour 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 hours 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Vital Bus Rect.
8.8 8.8 8.8 DG Bldg. Supply Fan (271A) 30.0 30.0 30.0 l
DG Blda. Exch. Fan 0.7 0.7 0.7 DG Prelube Puno 0.55 0.55 0.55 SG Area A/C Unit 16.5 16.5 16.5 Vital Bus Rect. 2-1 14.0 14.0 14.0 07 & RC Area A/C Unit 18.4 18.4 18.4 Boric Acid Trans. Puno 13.16 13.16 13.16 Battery Roam Exch. Fan 6.2 6.2 6.2 Recirc. Puno (2SRS*P25A) 1.0 1.0 1.0 AC Dist. Transf. (E-7) 2.9 2.9 2.9 j
AC Dist. Transf. (E-11) 2.1 2.1 2.1 Aux W Control Valves 1.05 1.05 1.05 I
Atm. Stm. Dunp Valves (101A. B & C) 1.05 1.05 1.05-Battery Charcer 14.6 14.6 14.6 24.6 River Water Pumo (Unit 1) 356.8 Control Room Supply &
Exh.' Fans (Unit 1) 77.6-E. Swgr. & Battery Room Sucolv & Exh. Fans (Unit 1)
~23.5 Control Roam HVAC Ctmpressor and Condenser Circ Pumo (Unit 11 60.8 Vital Bus Ioads (Unit 11 27.3 AC Dist. Transf. E1. E3 (Unit 1) 16.2
'IUTAL IDADS 3016.1 3248.1 3262.5 1072.2
'IUIAL IDADS ON INIT 2 EDG 3016.1 4320.3
- 3262.5 l
IKTIE: Diesel generator 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating 4535 kW. (Ref. UFSAR-2,.Section 8.3)
=
- Max Icad for NB0 and BO Unit (total) during SBO = 4320.3 kW.
L r
l 1