ML20115H871

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Provides Supplemental Info Re Design & Qualification of Equipment Provided at Remote Shutdown Panel or Redundant Remote Shutdown Capability & Capability to Communicate Between Remote Shutdown Room & Outside Plant Locations
ML20115H871
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 04/22/1985
From: Kemper J
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Schwencer A
Office of Nuclear Reactor Regulation
References
CON-#285-717 OL, NUDOCS 8504230300
Download: ML20115H871 (8)
v • d • e


Text

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PHILADELPHIA ELECTRIC COMPANY 23OI M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 (215)841-4502 VIC E#R ESID E NT ENG4NE E RONG AND RESE ARCH APR 221985 Mr. A. Schwencer, Chief Docket Nos.: 50-352 Licensing Branch No. 2 50-353 U. S. Nuclear Regulatory Commission Washington, D.C. 20555 FOL No.: NPF-27

Subject:

Limerick Generating Station, Units 1 and 2 Redundant Remote Shutdown Capability

Reference:

1) Teleconference between R. E. Martin and R. Stevens of the NRC and W.

W.

Bowers, D.

F.

Ciarlone, R. T. George, H.

D.

Honan, and E. F. Sproat of PECo dated March 28, 1985 on the same subject.

2) Letter, J.

S.

Kemper to A.

Schwencer " Request for Additional Information-Redundant Remote Shutdown Capability" April 18, 1985

3) Teleconference between W. Hodges, R. E. Martin, et al of the NRC and W.

W.

Bowers, D.

F.

Ciarlone, A. R. Diederich, R.

T.

George, J.

A.

Goldman, R. T. Robb, and T. J. Scull of PECo dated April 16, 1985 concerning the qualification of control room and Remote Shutdown System instrumentation File:

GOVT 1-1 (NRC)

Dear Mr. Schwencer:

During the reference 1 teleconference, the NRC requested clarifi-cation of information provided earlier by PECo to satisfy license condition 2.C.14a concerning remote shutdown capability at the Limerick Generating Station.

The reference 2 letter transmitted the requested information.

The purpose of this letter is to provide supplemental information requested by the NRC during the reference 3 teleconference concerning 1) the design and qualification of the equipment provided at the remote shutdown panel or for the redundant remote shutdown capability, including sufficient information to demonstrate that the equipment required for remote shutdown is safety related and seismically qualified and 2) the capability to communicate between the remote shutdown room and plant locations outside the remote shutdown room.

kn w=m n8%.

F

Mr. A. Schw:nc'ar 2

The attached table lists the equipment, including indicators, provided on the remote shutdown panel, corresponding control room equipment, and the equipment to be used to provide redundant remote shutdown capability.

Sufficient information is provided in the accompanying notes to justify the design and qualification of the equipment comprising the remote shutdown system and the redundant shutdown capability. The table shows the safety-related and seismically qualified equipment, including indicators, that is required to safely shutdown the plant from both the remote shutdown panel and the redundant remote shutdown capability. The equipment that is not safety related and seismically qualified is either not required to safely shutdown the plant or the associated design function is provided for by the use of procedures and safety-related equipment as described in the accompanying notes. Operability of both the safety related and non-safety related remote shutdown system equipment is assured by the surveillance requirements for that equipment under Technical Specifications sections 3/4.3.7.4.

The plant communication systems are described in FSAR section 9.5.2 and RAI's 430.60 through 430.64. Access to three independent communication systems is provided in the remote shutdown room via:

1) the plant telephone system 2) the plant public address system 3) a base station to access the plant's distributed antenna system to communicate with other base stations and hand-held walkie-talkies throughout the plant, The information contained in this letter, along with the information transmitted to you in reference 2, is sufficient 1) to demonstrate that safe shutdown can be achieved frcm the remote shutdown panel or via the redundant remote shutdown capability using only safety-related and seismically qualified equipment and 2) to identify the design changes to be impicmented during the first refueling outage to eliminate the need for installing temporary jumpers when using the redundant remote shutdown capability. Hence, we believe that license condition 2.C.14a is satisfied.

Sincerely, E

bo&b.

f RTJ/daz/4198501 Attachment Copy to:

(see attached Service List)

Attachment it Page 1 Table 1: Desion And Qualification Recairements Of Eauionent Provided For RearAe Shutdown And The Corresoondine Control Room Eautoment EIISTIE EETE SWTDOWi CORRESPOEIE CONTR(L EDUIPPENT USED FOR INTERIM 8 WTES PAIEL EDUIPIENT ROOM EEllppENT FINAL EDlMANT RENOTE SWTDOWI PROCEDUES SAFETY / SEISMIC SAFETY / SEISMIC SAFETY / SEISMIC ELATED GUAL RELATED QUAL RELATED OUAL RCIC Systes 1.

1416-49-191 YES YES N/A N/A 1

2.

HSS-49-192 YES YES N/A N/A 1

3.

14i5-49-193 YES YES N/A N/A 1

4.

HSS-49-195 YES YES N/A N/A 1

5.

IfiS-49-1%

YES YES h/A N/A 1

6.

W-49-1F076 YES YES W-49-1F076 YES YES HPCI 2

7.

W-49-1F060 YES YES W-49-lF060 YES YES HPCI 2

8.

W-50-Il2 YES YES W-50-112 YES YES WCI 2

9.

W-50-1F045 YES YES W-50-1F045 YES YES HPCI 2

10. W-49-1F006 YES YES W-49-!F006 YES YES HPCI 2

!!. W-49-1F007 YES YES W-49-1F007 YES YES HPCI 2

12. W-49-1F031 YES YES W-49-1F031 YES YES HPCI 2
13. W-49-1F029 YES YES HV-49-1F029 YES YES HPCI 2
14. HV-49-1F010 YES YES W-49-1F010 YES YES HPCI 2
15. W-49-!F019 YES YES W-49-1F019 YES YES WCI 2
16. HV-49-1F022 YES YES W-49-lF022 YES YES HPCI 2
17. W-50-1F046 YES YES HV-50-1F046 YES YES HPCI 2
18. W-49-!F012 YES YES HV-49-1F012 YES YES HPCI 2
19. W-49-1F013 YES YES W-49-1F013 YES YES WCI 2
20. 10P220 NO NO 10P220 NO NO N/A 3
21. 10P219 NO E

10P219 le PC N/A 3

22. W-49-1F002 YES YES HV-49-lF002 YES YES I43CI 2
23. HV-49-1F000 YES YES HV-49-1F000 YES YES HPCI 2
24. HV-49-lF084 YES YES HV-49-1F084 YES YES HPCI 2
25. SI-50-lR003 NO le SI-50-101 NO NO N/A 4,23
26. FC-49-lR001 YES YES FC-49-1R600 YES YES HPCI 2
27. FI-49-1R001-1 YES YES FI-49-IR600-1 YES YES FIS-55-1N651 YES YES 23
28. LI-55-112-2 NO NO LI-55-110-1 NO NO LIS-55-1N661B YES YES 5,23

!Luglear Boiler SYstM

29. HSS-41-191 YES YES N/A N/A 1
30. PI-42-!R0!!

YES YES IR-42-lR6234 YES YES PIS-42-1N6908 YES YES 23

31. LI-42-IR010 YES YES IR-42-lR623A YES YES LIS-42-1N6918 YES YES 23
32. PSV-41-1F013A YES YES PSV-41-lF0134 YES YES PSV-41-1F0l K, YES YES H,K,M,&S
33. PSV-41-1F013C YES YES PSV-41-1F013C YES YES PSV-41-IF013E,YES YES H, K,N, &S
34. PSV-41-!F013N YES YES PSV-41-lF013N YES YES PSV-41-lF0lK,YES YES H,N, N,4S i

s

-. : page 2 Table 1: Cont'd M Srstes E. 1 5 51-12 WS MS WA WA 1

& M41-193 WS VES WA WA 1

.TI.

W 194 WS VES WA WA 1

E Wi-12 WS MS WA WA 1

39. I M 1-196 WS WE WA WA 1

& W 197 MS VES WA WA 1

e. W 195 VES MS.

WA WA 1

42. W-51-1F005 WS VES W-51-1F009 VES VES WA 6
43. W41-1F000 ES VES W-51-1F008 VES VES WA 7
44. W41-1F00EA VES VES W-51-1F00EA WS VES W41-lF00GB VES WS t-
45. W-51-lF00GB VES VES W-51-1F0065 YES

- VES WA 8

46. W41-1F004A ~ VES VES W-51-1F0044 VES VES W-51-1F0048 VES WB
47. lAptet VES VES 149202 MS VES 1B0002 VES WS
44. W-43-!F025 lEl W

W-43-1F0tM IEl IEl WA 9

C. MB-43-191 W

IEl WA WA 10

50. W-51-lF00M WS WS W-51-1F00M VEB WS W-51-1F00M YES MS
51. W41-1F040A VES MS W-51-1F040A WS VES W-51-1F048 VES' YES l.
2. W-51-lF015 VES MS W41-1Mim

.. WB WS W-51-1F015 WS VES S. W-51-1FUE2 VES VES W-51-!F0ER

.VES

. MS WA 11 l

54. W41-!F0E3 MS VES W-51-1F083 VES

' YES WA 11 i

5. W-51-IF014A WS WB W-51-1F0 LEA VES WB Wo.,

12

5. W41-1FollA VES VES W-51-1F011A WS VES W41-1F011B VES MS l
57. W-51-1F013 YES MS W-51-1F0lM VEB VES W41-1Fol?B VEB VES l
58. W-51-!F004A MS MS W-51-1F004A VES WB W-51-1F0248 VEB VEB

[

59. W-51-!F0fm MS VES W41-!F02M MS VEB W-51-!F0f7B YES VES
60. W41-1F04M VES VES W-51-lF04M VES VES W-51-1F047B MS VES
61. W-51-1F003R VES VES W41-1F003R VES VES.

W-51-!F005 VES VES 4

- 62. W-51-1F01EA VEB WS W-51-1F00EA WS-VES W-51-1F00GB VES VES i

63.' W-51-lF049 WS VEB W-51-1F049 VES VES WA 13 i.

64. W-51-125

.VES VES W-51-125R '

WS VES W-51-129 VES VES i

E5. W-51-1F05EA VES VEB W-51-!F052A VES VEB W-51-1F05EB WS VES

66. W-51-153R VES VES W-51-153R WS VES W-51-153 VES VEB
67. FI-51-IN005 YES VES F1-51-1NE0M MS VES FIS-51-ilE5EB WS VEB 23 -
68. !!41-144-2 lEl NO

!!-51-146-1 W

IEl WA 4,23 H Burvice Ifater 9vstas

69. W-124154 VEB MS 1E15-12-0150-1 VES VES WA 14

[

M. W-124tE-2 MS ES WB-12415C-1 VES VES WA 14

71. 45-12416&2 WS WS HBB-12416A-1 WS VES WA 14
72. IW-12416C-2 VES MS im 12416C-1 MS VES WA 14
73. ' W 094 WS MS WA WA 1
74. W-12493 MS MS WA WA 1
75. W41-lF0144 VES WS W41-1F0144 VES MS W-51-!F0148 YES VES E 0Ap506 VES WS CAP 506 VES VES 038506 VES VES
77. W-51-lF060A MS VEB W-51-lF060A VES VES W-51-1F068 VES VES
78. PI-12-00144 W NO PI-12401A-1 lEl W

PI-12-00ES lEl IEl 15,23

79. P!-51-105&2 W IEl PI-51-1054-1 lEl NO PIS-51-103 IEl IEl 16,23 D. W-12-005 MS VES W-12-005 VES VES WA 17
81. W-1241M MS VES W-12-0!M ES MS WA 17 C. W-114154 VES MS W-11-015R WS VES N/A 17

. : Page 3 Table 1: Cont'd Emeraency Service Water Systga

83. 0AP548 YES YES 0AP548 YES YES OBP548 YES YES
84. PI-11-003A-2 2 NO PI-11-0034-1 NO NO PI-11-002B NO NO 18,23 C. W-11-011A YES YES W-11-011A YES YES W-11-011B YES YES
86. 166-11-091 YES YES N/A N/A 1
87. 16 6-11-092 YES YES N/A N/4 1
88. 16 6-11-093 YES YES N/A N/A 1

Containment and Suporession Pool Nonitorino Systen

89. PI-42-170-2 YES YES PI-42-170-1 YES YES PIS-42-1N6948 YES YES 23
90. TI-57-122 YES YES TR-57-122 YES YES N/A 4,23
91. LI-55-115-2 le le LI-55-115-1 W

NO LIS-55-1N662B YES YES 19,23

92. TI-51-104A NO NO TRS-55-1R605 NO NO EIFD6(interie W NO 20,23 via TE-51-1048)

Standby AC power Sucoly

93. 12-11509/CSR YES YES 152-11509/CS YES YES N/A 21
94. 12-11609/CSR YES YES 152-11609/CS YES YES N/A 21
95. 12-11709/CSR YES YES 12-11709/CS YES YES N/A 21

% 152-11502/CSR YES YES 12-11502/CS YES YES N/A 21

97. 12-11602/CSR YES YES 152-11602/CS YES YES N/A 21
98. 12-11702/CSR YES YES 152-11702/CS YES YES N/A 21
99. 12-11505/CSR YES YES 152-11505/CS YES YES N/A 22 100,12-Il605/CSR YES YES 152-11605/CS YES YES N/A 22 101.12-11705/CSR YES YES 152-11705/CS YES YES N/A 22 102. 143-115/CS YES YES N/D N/A 1

103. 143-116/CS YES YES N/A N/A 1

104. 143-117/CS YES YES N/A N/A 1

Note 1: These itses are remote shutdown panel system transfer switches provided to transfer control of selected systees from the control roca to the remote shutdown panel. The failure of one of these switches would require implementation of the interin or final redundant remote shutdown procedure to provide the necessary remote shutdown functions. System transfer switches are not required and hence, are not provided in the control room. Transfer switches will be provided on the B IHRSW, B RHR, and B ESW pump setor circuit breaker cubicles to transfer contol of the respective pump motor to its circuit breaker test switch without the need to install temporary jumpers. Otherwise no additional transfer suitches are n quired to implement the interim or final redundant remote shutdown procedure.

Note 2: The redundant method provided for high pressure coolant make-up is to use the HPCI system per the interis or final ndundant muote shutdown procedure. All equipment, including indicators, required for HPCI operation is safety-related and seismically qualified.

Note 3: These items are the RCIC barometric condensor cordensate pump (10P220) and the RCIC barometric condenser vacuum pump (10P219). These itses are not required to operate for RCIC to perfore it design basis function to provide high pressure reactor coolant make-up. The failure of these devices will rot prevent the operation of RCIC during shutdown from the control room or the remote shutdown panel or during use of the interim or final redundant remote shutdown procedure. Hence, the nonsafety-related classification of this equipment is acceptable and ro redundant equipment is provided.

l

l

+ - _

' : page 4 Table la Cont'd Note 4: These parameters are not required to bring the plant to a hot shutdown or a cold shutdown condition. Hence, redundant indication is not required.

a) Item 25 provides indication of E!C turbine speed. RCIC operation is monitored via the RCIC flow indicator. Loss of EIC turbine speed indication will not prevent shutdown from the remote shutdown panel or during use of the i

interia or final redundant remote shutdown procedure.

b) Ites 68 provides position indication of the A H heat exchanger bypass valve. The A M heat exchanger byp p valve is throttled to regulate M loop A flow to maintain a reacter cooldown rate less than or equal to 100 F. per hour. There is no established relationship to determine reactor cooldown rate free bypass valve position. The reactor cooldown rate is deterairw! by observing reactor pressure. Loss of bypass valve position indication will not prevent shutdown from the remote shutdown panel or during use of the interim or final redundant remote redundant procedure.

l c) Item 90 provides drywell airspace temperature indication. There are no postulated accidents or transients in the l

remote shutdown scenario that would cause a significant increase in drywell temperature and require sitigating or protective actions. No equipment is provided on the remote shutdown panel to protect against or mitigate a significant increase in drywell temperature. Drywell pressure indication is provided on the remote shutdown panel as mell as in the interim and final redundant remote shutdown procedures. Loss of drywell temperature indication will not prevent shutdown from the remote shutdown panel or during use of the interim or final redundant remote shutdown procedure.

Note 5: This item is condensate storage tank level indication, provided for status indication only. This indication is not required to bring the the plant to a cold shutdown condition. Loss of this indication will not prevent shutdown fros the remote shutdown panel or during use of the interim or final redundant remote shutdown procedure. Hence, saftey-related indication is not provided on the remote shutdown panel. The remote shutdown panel indication meets the L

same design and qualification requirements applied to the corresponding control room indicaton. Redurdant indicatien of condensate storage tank level is available in the auxiliary equipment room for use when implementing the interim or final redundant remote shutdown procedure.

Note 6: This itse is the inboard RHR shutdown cooling suction valve. Failure of this valve to operate will require initiation of ' Alternate Shutdown Cooling via LpCI" using safety-related and seismically qualified equipment per the l

interis or final redundant remote shutdown procedure.

Note !: This item is the outboard RHR shutdown cooling suction valve. The redundant method to position this valve is to manually position it per the interim or final redundant remote shutdown procedure.

Note 8: This item is the B RHR pump shutdown cooling suction valve. Control of this valve is provided on the remote shutdown panel to block the shutdown cooling flowpath to the B RHR pump. The redandant method to position this valve is to manually close it.

Note 9: This item is the reactor recirculation pump suction valve. Control of this valve is provided on the remote shutdown panel to close the valve when operating the A loop of RHR in the shutdown cooling mode. The design and qualification requirements of this valve are equivalent te the design and qualification requirements of the nonsafety-related Reactor Recirculation systes. Should this valve fail to operate a redundant injection path is available by realigning the shutdown cooling line-up to inject via the A loop LpC1 line using safety-related and seismically qualified equipment per the Remote 9)utdown procedure. The redundant method of shutdown cooling is to align the B loop of H for ' Alternate Shutdown Cooling via LpCI' using safety-related and seismically qualified equipment per the interim l

l or final redundant remote shutdown procedure.

1 Note 10: This itse is a remote shutdown panel systes transfer switch. This switch transfers control of the nonsafety-related valve W-43-IF023A free the control room to the remote shutdown panel and activates nonsafety-related indicators Lt-55-It2-2, L1-55-il5-2, and !!-51-148-2 on the reacte shutdown panel. Failure of this switch would result in the loss of indicators LI-55-ll2-2, LI-55-ll5-2, and !!-51-148-2 and control of valve W-43-IF023A. As shown in notes 4, I

5, 9, and 19, loss of these indicators and control of valve HV-43-lF0234 will not prevent shutdown from the remote shutdown panel or during use of the interie or final ' redundant remote shutdown procedure. Hence, the nonsafety-related classification of this switch is acceptable.

L

w,

. : Page 5 Table 1: Cont'd Note 11: These items are the M reactor vessel head spray valves. Control of these valves is provided on the remote shutdoun panel to aid in depressurizing the reactor vessel. The H head spray subsystou utilizes equipment designed to safetyvelated design and qualification requirements, however the M head sray subsystes is not required to achieve cold shutdann and does not include redundant loops to perfore the H headspray function. Failure of one of these valves to operate will not prevent shutdoun from the remote shutdown panel or during use of the interim or final redundant remote shutdoun procedure. Hence, a redundant reac. vessel head spray sesystem is not provided.

Note 12: This item is the M dryuell spray valve. Control of this valve is provided on the remote shutdown panel to

. block the dryuell spray flampath. The redundant method to position this valve is to manually close it.

Note 13: This item is the M discharge to radweste valve. Control of this valve is provided on the remote shutdown panel to block the H discharge to radmaste flowpath. The redundant method to position this valve is to manually close it.

Note 14: These items are the spray pond / cooling teuer selector switches provided to align the A MSW and A ESW loops in either the cooling teuer or the spray pond (spray network / winter bypass) modes. The redundant methed to align the A IB M i and A E W loops is to manually position the loop valves. Failure of one of these valves to operate would require implementation of the interim or final redundant remote shutdown procedure to manually align the B HSW or B ESW loops using safety-related and seismically qualified valves W-12-017A, W-12-03294D, and W-12-034B in the necessary configuration.

Note 15: ' This item is the A MSW pump discharge pressure indication, provided for status indication only. This

. indication is not required to bring the reactor to a cold shutdown condition. Loss of this indication will not prevent shutdoun from the remote shutdoun panel or during use of the interis or final redundant remote shutdown procedure. The remote shutdoun panel indication meets the same design and qualification requirements as the corresponding control room indication. The same sensor is unid for both the control room and remote shutdown panel indicators. Redundant indication is available in the spray pond pump ?ouse for use uhen implementing the interie or final redundant remote shutdown procedure. Safety-related and seismically qualified MSW systes flow indication is provided in the control room for post-accident conditions.

Note 16: This item is the A M heat enchanger MSW discharge pmssure indication, provided for status indication only. - This indication is not required to bring the reactor to a cold shutdown condition. Loss of this indication will not prevent shutdoun free the remote shutdown panel or during use of the interia or final redundant remote shutdown procedure. The remote shutdown panel indication asets the same design and qualification requirements as the corresponding antrol room indication. The same sensor is used for both the control roce and remote shutdown panel indicators.

Redundant indication is available in the B H room for use when implementing the interiu or final redundant remote shutdoun precedure. Safety-related and seismically qualified M SW systes flow indication is provided in the control room for post-accident conditions.

Note 17: These items are MW and EW valves. In order to place N SW and ESW in a configuration such that they can be readily placed in service free the remote shutdown panel, these valves automatically close when the remote shutdown panel erstem transfer switches are placed in DER. These valves are not required to change position once they have closed and remain closed as long as the transfer switches are in DER. The redundant method to position these valves is to manually closethem.

Note 14: This item is EW puso discharge pressure indication, provided for status indication only. This indication is not required to bring the plant to a cold shutdown condition. Loss of this indication will not prevent shutdown from the remote shutdoun panel or during use of the interie or final redundant remote shutdown procedure. The remote shutdown panel indication meets the same design and qualification requirements as the correspopnding control room indication. The same senser is used by both the control room and remote shutdoun panel indicators.' Redundant indication is available in the spray pond pump house for use uhen implementing the interim or final redundant remote shutdown procedure.

Safety-related and seismically qualified ESW system fica indication is provided in the control room for post-accident conditions.

~

=.

s Rttachment 1: page 6 i

j Table 1: Cont'd j

Note 19: This itse is suppression pool lew! indication, provided for status indication only. The remote shutdown scenario does not include any accident or transient conditions that uould cause a sipificant change in suppresion pool lowl. The plant Technical Specifications require that a sinism lewl be saintained in the suppression pool. This cinimum lowl would be applicable at the start of a remote shutdown event. Consequently, sufficient level will be 4

available in the suppression pool throughout the remote shutdown event. Loss of this indication will not prevent shutdown free the remote shutdoun panel or during the use of the interim or final redundant remote shutdown procedure. The remote clutdown panel indication meets the same desip and qualification requirements as the correspopnding control room indication. The same sensor is used for both the control roce and remote shutdown panel indicators. Redundant indication is available in the auxiliary equipment room for use when implementing the interie or final nduMant remote shutdown 4

procedure. Safety-related and seismically qualified suppression pool level indication is provided in the control room for post-accident conditions.

i Note 20: This itse is suppression pool temperature indication, provided for status indication only. Loss of this indication sill not prevent shutdoun free the remote shutdown panel or during the use of the interie or final redundant remote shutdoun procedure. The remote shutdoun shutdown scenario does not include any accident or transient corslitions that would cause a significant increase in the heat load on the suppression pool other than that espected free decay and j

sensible heat during a normal shutdoun with the IEIVs closed. The plant Technical Specifications require that the suppression pool temperature be maintained below a manies limit which would be applicable at the start of a remote shutdeun event. During the remote shutdoun event, reactor pressure will be maintained at a nominal 1000 psig or reduced to establish shutdoun cooling by annually operating the osin steam relief valves. Remote shutdown operating procedures require establishing suppression pool cocling early in the event, thereby maintaining the suppression pool temperature I

cithin acceptable limits. Consequently, sufficient heat capacity will be available in the suppression pool throughout the remote shutdoun event.

j ene remote snutdown panel indication seets the same desip and qualification requirseents as the corresponding control room indication. The same sensor is used by both the control room and remote. shutdown panel indications. Redundant indication is available on the END6 or in the B 25l room for use den implementing the interia or final redundant remote shutdown procedure.

Safetyvelated and seismically qualified suppression pool temperature indication is provided in the control room for post-accident conditions.

l Ibte 21: These itses are safeguard switchgear feeder breaker control switches. These switches provide manual control of the application of offsite poner to the division I, !!, and !!! safeguard Nsses. The design basis for the remote shutdown system includes a loss of offsite power. The diesel generators will automatically start and supply poer to the division I, !!, and !!! safeguard busses. Therefore these itses are not required to operate to support shutdown from the remote shutdoun panel or during use of the interim or final redundant remote shutdown procedure. Hence,redurulant controls to supply offsite power to the division I and !!! safeguard busses, are not required. Redundant control for the division !! feeder breaker is provided on the breaker cubicle for compliance with fire protection safe shutdown requirements for an exposure fire in the remote shutdown roce.

Note 22: These itses are safeguard load center transforeer breaker control switches. These switches provide annual l

control of the application of poner to the safeguard 440 Volt load centers. These breakers automatically close on availability of safeguard bus voltage. The failure of one of these breakers would require implementation of the interie or final redundant remote shutdoun procedure to provide the necessary remote shutdown functions using safety-related and seismically qualified equipment. Hence, redundant contrSis to operate the division I and !!! safeguard load center l

breakers are not required. Redundant control for the division !! safeguard load center transforeer breaker is provided on the breaker cubicle for compliance eith fire protection safe shutdoun requireernts for an esposure fire in the remote shutdoun room.

Note 23: The operability of the remote shutdown panel instrument loop is periodically tested by performing a channel check once pse month and a channel calibration once per refuel cycle in accordance with the requirseents of Technica!

Specification section 3/4.3.7.4.

i

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