ML20091P246
| ML20091P246 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/21/1995 |
| From: | Nix D DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML16141A943 | List: |
| References | |
| PROC-950821, NUDOCS 9509010094 | |
| Download: ML20091P246 (8) | |
Text
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4 August 21, 1995 To: Manual Holders
Subject:
Oconee SLC Revision This revision to the SLC Manual revin.v. SLC Section 16.9.8 to provide additional restrictions as to when the HPSW system is considered available with regard to supporting the operability of LPSW system.
Please update your copy of this manual as follows:
Remove These Pages Insert These Pagest LOEP 1 LOEP 1 LOEP 5 LOEP 5
.LOEP 6 LOEP 6 16.9-26 16.9-26 16.9-27 16.9.27 16.9-28 16.9-28
16.9-28a Any questions cc erning this revision may be directed to David Nix 803-885-3634.
David Nix Regulatory Compliance By: Conice Breazeale Regulatory Compliance
+
9509010094 950821
>PDR ADOCK 05000269 E- --.~.._l____PDR_.
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- Oconee Nuclear Station
. Selected Licensee Commitments I List of Effective Pages Eagt Revision Date Cover Letter LOEP 1 8/15/95 LOEP 2 10/93 LOEP 3 5/11/95 LOEP 4 7/31/95 LOEP 5 8/15/95 LOEP 6 8/15/95 LOEP 7 5/11/95 Tab 16.0 16.0-1 1/9/95 16.0 5/11/95 16.0-3 1/9/95 Tab 16.1 16.1-1 Tab 16.2 16.2-1 16.2-2 16.2-3 Tab 16.3 16.3-1 2/91 Tab 16,5 16.5-1 3/91 16.5-2 2/17/94 16.5-3 2/17/94 16.5-4 2/17/94 16.5-5 2/17/94 8/15/95 Page 1
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4 EAge No. Revision Date f
- l 16.9-24 7/31/95 16.9-25 7/31/95 16.9-26 8/15/95 l
16.9-27 8/15/95 16.9-28 8/15/95 16.9-28a 8/15/95 16.9-29 1/9/95 16.9-30 1/9/95 Tab 16.11
+ 16.11-1 02/93 16.11-2 02/93 16.11-3 02/93 16.11-4 02/93 16.11-5 02/93 16.11-6 02/93 16.11-7 02/93 16.11 8 02/93 16.11-9 02/93 16.11-10 07/94 16.11-11 07/94 16.11-12 07/94 16.11-13 07/94 16.11-14 07/94 16.11-15 07/94 16.11-16 07/94 16.11-17 07/94 16.11-18 07/94 8/15/95 Page 5
Page - Revision 16.11-19 07/94 16.11-20 07/94 16.11-21 07/94 16.11-22 07/94 16.11-23 07/94 16.11-24 07/94 16.11-25 07/94 16.11-26 2/91 16.11-27 2/91 16.11-28 10/93 16.11-29 10/93 16.11-30 10/93 16.11-31 2/91 16.11-32 2/91 16.11-33 2/91 16.11-34 2/91 16.11-35 2/91 16.11-36 2/91 16.11-37 02/93 16.11-33 02/93 16.11-39 2/91 16.11-40 2/91 16.11-41 10/93 16.11-42 10/93 16.11-43 2/91 16.11-44 2/91 8/15/95 Page 6
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.s 16.9 ' AUXILIARY SYSTEMS ,
16.9.8 HPSW PUMP REQUIREMENT TO SUPPORT LPSW ,
COMMITMENT ,
Adequate suction to the LPSW Pumps requires water from the CCW system to be supplied.- In order for water to be supplied to LPSW from CCW during a LOCA/ LOOP, HPSW is required to support initial CCW siphon flow and subsequent CCW pump restart. This requires BOTH of the following conditions:
- 1. Two HPSW Pumps shall be operable and capable of restarting prior to complete drain of the Elevated Water Storage Tank (EWST), to provide sealing ,
water for CCW Pump shafts to prevent loss of siphon flow and to provide ,
cooling for the CCW Pump (s) after re-start of the CCW Pump (s).
AND EITHER 2.a. Elevated water storage tank with HPSW-25 functionally operable to provide sealing / cooling water for CCW Pumps.
OR 2.b. Minimum lake level to provide true gravity flow to the suction of the LPSW Pumps without dependency on siphon flow. (See SLC 16.9.7 )
I APPLICABILITY. I l
Any time the LPSW system is required to be operable. Action statements apply to all three units.
ACTION:
- a. If the HPSW Jockey Pump is unable to maintain EWST level or fill the EWST, it shall be declared out of service,
- b. If any two HPSW Pumps (HPSWP "A", HPSWP "B", or Jockey Pump) are removed from service or inoperable, the LPSW system is not single failure proof.
Enter a 72' hour LCO per Technical Specification 3.3.7.b.
- c. If either of the two Unit 1 Main Feeder Busses is out of service or inoperable, then the LPSW system is not single failure proof. Enter a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> LCO per Technical Specification 3.3.7.b.
- d. If three HPSW Pumps (HPSWP "A", HPSWP "B", and Jockey Pump) are removed from service or inoperable at the same time, then the LPSW system is !
inoperable. Enter Technical Specification 3.0, 4
8/15/95 16.9-26 1
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- e. If the 'EWST is out of service AND the lake level is not adequate t o support '
gravity flow, then the LPSW system is inoperable. (NOTE: EWST is considered out of service if HPSW-25 is out of service or if in any way water cannot be supplied from the EWST via the sealing water path to CCW Pumps or if EWST level cannot be maintained > 70,000 gallons). Enter Technical Specification 3.0.
SURVEILLANCE:
Surveillance per SLC 16.9.1 and the Appendix B testing program is adequate to demonstrate the availability of the equipment and systems discussed here.
BASES:
The HPSW system provides support for the LPSW system suction, station fire suppression capability, back up service water to HPI Pump Motor and Bearing coolers, and back up service water to the TDEFW Pump Bearing and Oil coolers.
HPSW system make-up demands are normally met by the HPSW Jockey Pump.
l The HPSW system must provide upper guide bearing sealing and motor cooling to {
l the CCW Pumps to ensure the CCW system can provide a suction supply to the LPSW system. Sealing is required any time the CCW system is in the siphon flow mode of operation. Cooling to the CCW Pump motors is required any time the CCW Pumps are required to operate.
At certain lake levels unassisted gravity flow may be possible. If so, the EWST is not required to support siphon flow by providing sealing of the CCW Pump Upper Guide Bearing to prevent some of the air inleakage that could defeat the ECCW siphon. However, HPSW is still required to support operation of the CCW Pumpo since procedures require that the CCW pumps must be restarted following a LOCA/ LOOP.
LPSW takes suction from the CCW crossover header. During certain analyzed l i
accident conditions, a loss of power to the CCW Pumps for all three units must
. be assumed. This results in a loss of forced flow to the CCW crossover l header. Initially, the sealing requirements are met via the EWST. The
- duration of the event may last beyond the capability of the inventory of the
! EWST. Therefore the HPSW Pumps must be capable of being started following a
- loss of power in order to meet the cooling and seal lubrication requirements ,
j of the CCW Pumps. ;
The HPSW Jcckey Pump is supplied by " load shed" power and would not be available until after the load shed is reset. The CCW Design Basis Dorament (Section 20.1.1.3) requires a re-start of a CCW Pump within one and one half hours. The load shed must be reset to restart the CCW pump, thus the power would also be available to the Jockey Pump within that time frame. The Jockey l Pump is of smaller capacity, would not meet fire protection capacity requirements, and would take longer to refill the EWST. Therefore, the Jockey l Pump is considered as a substitute for an HPSW Pump only for purposes of J
8/15/9L 16.9-27 J
d supporting the siphon or che restart"of a CCW Pump and not for Fire Protection.
The HPSW Jockey pump is of smaller capacity than HPSW pumps A and B.
Calculation OSC-5945 "HPSW Pump and Fize Protection Flow Test Acceptance Criteria" calculates the accident loads and concludes the HPSW Jockey pump has sufficient capacity to supply those loads plus system leakage provided it is j able to maintain EWST level or fill the EWST in normal usage. Accident loads plus system leakage are calculated to be approximately the same as normal j loads plus normal system leakage.
l f All three HPSW pumps are powered from the Unit 1 Main Feeder Busses. Backup
- power to the Unit 1 Main Feeder Busses 4.c not available from another unit.
! Therefore, if one of the two available Unit 1 Main Feeder Busses is removed from service, then the remaining HPSW pumps are vulnerable to a single failure
! of the other Unit l' Main Feeder Bus. This would also result in LPSW not being
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single failure proof since HPSW is necessary for LPSW operation in the i conditions described above. This condition would affect LPSW for all three l units.
1 1 An EWST level of 70,000 gallons is chosen as the minimum level for EWST operability since this is the lowest level which would exist during normal a daily operation. An EWST level of 70.c5C gallons is the setpoint at which an
- HPSW pump in " base" would start to make up to the EWST. This situation would not be expected to occur during normal system operatior since the HPSW Jockey
- pump is capable of maintaining EWST level at 100,000 gallons.
REFERENcRR-4 1) OSC-5409 Rev 3, " Single Failure Analysis of the ECCW System Supply to'the LPSW System "
i OSC-5349 Rev 1, " Mininum I.ake Level Required to Maintain
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2) 4 Sufficient NPSH to the LPSW Pumps via Gravity Flow "
- 4) PIP 0-094-0952
, 5) PIP 0-094-0995 j 6) PIP 0-095-0307 i 7) PIP 0-095-0174
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f 8) Oconee FSAR Sections 9.2.2, 9.5.1, 15.0, Table 9-4, Figure 9-9 5 through 9-12; 1994 Update i
l 9) Technical Specifications 3.0, 3.3.7, 4.0.4, Table 4.1-2, as amended to 2/1/95.
8/15/95 e
16.9-28 i
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- 10) Selected Licensee Commitments 16.9.1, 16.9.7, as amended to 2/14/95
- 11) OSS-0254.00-00-10Cu, Rev 2, " Design Basis Specification for HPSW
- 12) OSS-0254.00-00-1039, Rev 2, " Design Basis Specification for LPSW l
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- 13) OSS-0254.00-00-1003, Rev 5, " Design Basis Specification for CCW " ,
- 14) Letter dated 4/20/94 from J. W. Hampton (DPC) to NRC regarding supplemental information for revision to Tech Spec 3.4.
4 STATION MANAGER APPROVAL .
DATE 1-n-15
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i 8/15/95 16.9-28(a)
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