ML19323E262
| ML19323E262 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/16/1980 |
| From: | Groce R Maine Yankee |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| WMY-80-78, NUDOCS 8005230293 | |
| Download: ML19323E262 (21) | |
Text
1 N
TURNPIKE ROAD (RT. 9) r ENGINEERING OFFICE WEST 8ORO, MASS ACHUSETTS 01581
<*f 617-366-9011 O
B.3.2.1 May 16, 1980 WMY 80-78 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Division of Licensing Mr. Robert A. Clark, Chief Operating Reactors Branch #3
Reference:
(a) License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPC, dated March 12, 1930 (c) MYAPC Letter to USNRC (WMY 80-58), dated March 28, 1980 (d) MYAPC Letter to USNRC (WMY 78-111), dated December 29, 1978 (e) MYAPC Letter to USNRC (WMY 79-146), dated December 12, 1979 (f) MYAPC Letter to USNRC (WMY 80-39), dated March 5, 12 0 (g) MY FSAR Question 7.2 and Response (h) MY FSAR Section 7.3.2 through 7.3.5 (i) Appendix A and B of MY FSAR
Subject:
Electrical Override / Bypass of Containment Purge System
Dear Sir:
Reference (b) requested that Maine Yankee provide the subject information.
Subsequent discussions with members of your staff permitted reducing the amount of detailed pictorial information to only those drawings related to the containment purging and venting system at Maine Yankee. Due to security concerns regarding the information contained in these drawings, they are being forwarded under another cover letter. The remaining information requested in Reference (b) is contained in Enclosures 1 and 2 of this letter.
We trust this information will be satisfactory; however, ehould you have any further questions, please contact us.
Very truly yours, MAIuE YANKEE ATOMIC POWER COMPANY k
DJ~
Robert H. Croce Senior Engineer - Licensiag RLS/kaf Attachment soonsko 2D
6 ENCLOSURE 1 RESPONSE TO NRC QUESTIONS ON ELECTRICAL OVERRIDE / BYPASS ASPECTS OF ESF SYSTEMS QUESTION 1:
The information presented in your FSAR and your letters of December 28, 1978, December 10, and 12, 1979, is not sufficient to determine if the following requirements are met for the safety signals to all Engineered Safety Features (ESF) equipment. Therefore, identify and justify all exceptions to the following:
CRITERION 1 - In keeping with the requirements of General Design Criteria 55 and 56, the averriding of one type of safety actuation a
signal (e.g., radiation) should not cause the blocking of any other type of safety actuation signal (e.g., pressure) for those valves that have no function besides containment isolation.
ANSWER:
No exceptions. However, as documented and justified in our December 29, 1978 letter to the NRR and our December 12, 1979 letter to the NRR, jumpers are used in one case to override a high-containment pressure signal to complete the Class A Containment Pressure Test.
CRITER10N 2 - Sufficient physical features (e.g., key lock switches) are to be provided to facilitate adequate administrative controls.
ANSWER:
No exceptions. See December 12, 1979 letter, Se;Aion 2b. g
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ENCLOSURE 1 CRITERION 3 - A system level annunciation of the overridden status should be provided for every safety system impacted when any override is active.
(See R.G. 1.47).
ANSWER:
No exceptions. See answers to AEC questions, FSAR question 7.2.
CRITERION 4 - Diverse signals should be provided to initiate isolation of the containment ventilation system. Specifically, containment high radiation, safety injection actuation, and containment high pressure (where containment high pressure is not a portion of safety injection actuation) should automatically initiate CVI.
ANSWER:
No exceptions. See December 29, 1978 letter.
CRITERION 5 - The instrumentation and control systems provided to initiate the ESF should be designed and qualified as safety grade l
equipment.
j ANSWER:
No exceptions. See FSAR Section 7.3.5.
1 f
b of the ESF actuation signal CRITERION 6 - The overriding or resetting 1
should not cause any valve or damper to change position.
ANSWER:
The evaluation of this criterion is presently being done per I&E Bulletin 80-06. Besolution of this item will be documented in that response.
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ENCLOSURE 1 QUESTION 2:
In addition to responding to the general questions above, please provide the following specific information:
(1) Provide an "as built" tabulation of all Engineered Safety features (ESF)/ Auxiliary Supporting Features (ASF) valves and dampers required to be ci,,erated automatically following an accident. This tabulation should include the following:
a.
Component designation b.
System served c.
Safety function (e.g., containment isolation, spray initiation) d.
Actuation signal sources Reference to control circuitry (see 2.(3) below) e.
f.
Indication whether or not the component safety function indicated in 2.(1) above can be defeated through the use of a manual override or bypass g
in either the contrcl system or actuation signal system circuitry.
ANSWER:
See Table I.
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ENCLOSURE 1 TABLE I (2.1)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.s 2.1.b 2.1.c 2.1.e 2.1.d&f a
MOV6013 Control Room Standby Air CIS ESK-6CR 1, 2 (NA)
ESK-7C MOV6010 Control Room Exhaust Air CIS ESK-6CR 1, 2 (NA)
ESK-7C SOV-257K High Pressure Drain Cooler CIS/SIAS ESK-7C, 7L, 7J 2
(DR-A-6)
Outlet 1.29-26 SOV-351K Safety Inj. Test and Safety CIS/SIAS ESK-7C 2
(SIA-A-47)
Inj. Tank Sample ESK-7L, 7J SOV-6006 Containment Purge Exhaust CIS/SIAS ESK-7C 2, 4 (VP-A-5)
Duct ESK-7L, 7J SOV-6009 Containment Purge Supply CIS/SIAS ESK-7C 2, 4 (VP-A-1)
Duct ESK-7L, 7J SOV-3501 Reactor Coolant Sample CIS/SIAS ESK-7C 2
(PS-A-15)
ESK-7L, 7J SOV-3502 Reactor Coolant Sample CIS/SIAS ESK-7C 2
(PS-A-4)
ESK-7L, 7J SOV-3503 Reactor Coolant Sample CIS/SIAS ESK-7C 2
(PS-A-1)
ESK-7L, 7J SOV-3504 Reactor Coolant Sample CIS/SIAS ESK-7C 2
(PS-A-2)
ESK-7L, 7J /
ENCLOSURE 1 9
TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f SOV-3505 Reactor Coolant Sample CIS/SIAS ESK-7C 2
(PS-A-3)
ESK-7L, 7J SOV-3508 Reactor Coolant Sample CIS/SIAS ESK-7C 2
(PS-A-8)
ESK-7L, 7J SOV-2001 Containment Air Monitor CIS/SIAS ESK-7C 2
(1A-A-101)
Return ESK-7L, 7J SOV-3303 Containment Sump Pump CIS/SIAS ESK-7C 2
(PD-A-122)
Discharge ESK-7L, 7J SOV-2003 containment Leak Detection CIS/SIAS ESK-7C 2
(LM-A-45)
ESK-7L, 7J SOV-2601 Steam Generator Blowdown CIS/SIAS ESK-7C 2
(BD-T-12)
ESK-7L, 7J SOV-2602 Steam Cenerator Blowdown CIS/SIAS ESK-7C 2
(BD-T-22)
ESK-7L, 7J SOV-2603 Steam Cenerator Blowdown CIS/SIAS ESK-7C 2
(BD-T-32)
ESK-7L, 7J i
SOV-2604 Main Steam High Pressure CIS/SIAS ESK-7C 2
(HPD-A-96)
Drain After Steam Trap ESK-7L, 7J SOV-3002 Quench Tank Pump Discharge CIS/SIAS ESK-7C 2
(PR-A-40)
ESK-7L, 7J J
ENCLOSURE 1 TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f SOV-3301 Hydrogenated Vent Header CIS/SIAS ESK-7C 2
(PV-A-10)
ESK-7L, 7J SOV-3410 Primary Component Cooling CIS/SIAS ESK-7C 2
(PCC-A-300)
From H.P. Drn, Quench Tank & New ESK-7L, 7J Shld Tk Cirs SOV-3413 PCC From Penetration Clrs CIS/SIAS ESK-7C 2
(PCC-A-216)
ESK-7L, 7J CO Isolation Inside CIS/SIAS ESK-7C 2
SOV-2906 e
2 (C-A-14)
Containment ESK-7L, 7J SOV-3416 PCC Return From CEA CIS/SIAS ESK-7C 2
(PCC-A-266)
Drive Mechanism Coolers ESK-7L, 7J MOV-3404 PCCW Supply to Reactor CIS ESK-7C 3
(PCC-M-219)
Coolant Pump ESK-6BL TV-3414 PCCW From Reactor Coolant CIS ESK-7C 2
(PCC-A-252)
Pump HCV-261
- 2RCP Seal Return Outlet CIS ESK-7C 2
(SL-M-40) 1.29-61C HCV-251
- 1RCP Seal Return Outlet CIS ESK-7C 2
(SL-M-29) 1.29-61C HCV-271
- 3RCP Seal Return Outlet CIS ESK-7C 2
(SL-M-51) 1.29-61C -
)
ENCLOSURE 1 TABLE I (2.1) (Cont.)
Reference to Control Circuitry Component Description (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f MOV-6017 Control Room Exhaust Air CIS ESK-6CR 1, 2 ESK-7D (NA)
MOV-6014 Control Room Air Conditioner CIS ESK-6CR 1, 2 ESK-7D (NA)
SOV-2012 Service Air Isolation CIS/SIAS ESK-7D 2
ESK-7K (SA-A-138)
TV-1102 Sta Cen Aux Feed CIS/SIAS ESK-7D 2
(MS-T-163)
Pump Stm Supply ESK-7K TV-2002 Cont Air Monitor Sample Out CIS/SIAS ESK-7D 2
ESK-7K (PAP-A-19)
TV-2004 Cont Leak Detection CIS/SIAS ESK-7D 2
ESK-7K (LM-A-43)
TV-2006 Cont Air Monitor Sample In CIS/SIAS ESK-7D 2
ESK-7K (IA-A-107)
TV-2605 Excess Flow Check Valve CIS/SIAS ESK-7D 2
(HPD-A-17)
Drains to Blowdown Tank ESK-7K TV-3001 Pressurizer Quench Tank CIS/SIAS ESK-7D 2
(PR-A-41)
Pump Discharge ESK-7K TV-3302 Primary Vent Header CIS/SIAS ESK-7D 2
ESK-7K (PV-A-12)
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ENCLOSERE 1 TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f TV-3304 Containment Sump Pump CIS/SIAS ESK-7D 2
(PD-A-124)
Discharge ESK-7K TV-3411 PCC From H.P. Drn Cooler CIS/SIAS ESK-7D 2
(PCC-A-302)
Pzr Quench Tk Clr Neutron Shid Tk TV-3417 PCC From CEA Drive CIS/SIAS ESK-7D 2
(PCC-A-270)
Mechanism Cirs ESK-7K TV-3007 Primary Water to Quench Tank CIS/SIAS ESK-7D 2
(PW-A-78) '
ESK-7K TV-2907 Carbon Dioxide Isolation CIS/SIAS ESK-7D 2
(C-A-15)
ESK-7K TV-2904 Nitrogen Supply to Containment CIS/SIAS ESK-7D 2
(N-A-66)
ESK-7K l
HCV-350K S.I. Test and S.I.
CIS/SIAS ESK-7D 2
(SIA-A-49)
Tank Liquid Sample ESK-7K HCV-6005 Cont Purge Duct Supply CIS/SIAS ESK-7D 2, 4 (VP-A-2)
Isolation ESK-7K HCV-6007 Cont Purge Duct Exhaust CIS/SIAS ESK-7D 2, 4 (VP-A-3)
Isolation ESK-7K HCV-6008 Cont Purge Duct Exhaust CIS/SIAS ESK-7D 2, 4 (VP-A-4)
Isolation ESK-7K
ENCLOSURE 1
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TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f TV-3506 Pressurizer Sta Interface CIS/SIAS ESK-7D 2
(PS-A-17) and RC Samples ESK-7K TV-3507A RC Loop Liquid Sample CIS/SIAS ESK-7D 2
(PS-A-23)
Isolation ESK-7K I
TV-3507B RC Loop Liquid Sample CIS/SIAS ESK-7D 2
(PS-A-20)
Isolation ESK-7K HCV-1001 Decay Heat Release Valve CIS/SIAS ESK-7D 2
(MS-A-162),,
(Maine Steam Atcospheric ESK-7K Dump)
TV-3415 PCC Water From RCP CIS ESK-7D 2
(PCC-A-254)
Isolation HCV-259K RCP Seal Water Return CIS ESK-7D 2
(SL-A-53)
Isolation HCV-204U Charging Pump Suction SIAS ESK-7J, 7M, 7E, 7F 3, 8, 9 (HSI-M-50)
From RWST RAS 1.29-104B HCV-312 SIS LP HDR TO LOOP 1 SIAS ESK-7K, 7M, 7J 8
(LSI-M-11) 1.29-106A HCV-322 SIS LP HDR TO LOOP 2 SIAS ESK-7K, 7M, 7J 8
(LSI-M-21) 1.29-106A J
ENCLOSURE 1 l
TABLE I (2.1) (Cont.)
i Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f I
HCV-332 SIS LP HDR TO LOOP 3 SIAS ESK-7K, 7M, 7J 8
(LSI-M-31) 1.29-106A HCV-204T Charging Pump Suction SIAS ESK-7K, 7M, 7E, 7F 8, 9, 3 (HSI-M-51)
Prom RWST RAS 1.29-1048 LCV-210Z Boric Acid Tank to SIAS ESK-7K, 7M 8
(BA-A-32)
Chem Tank 1.29-34C TCV-201K Mt Ex E-67 Letdown Temp SIAS ESK-7J, 7M 8
(LD-T-5) /
Control 1.29-103A SOV-4008A Chg PP Pri Sys Isolation SIAS ESK-7J, 7M 8
(CH-S-119)
HCV-313 SIS HP AUX HDR TO LOOP 1 SIAS ESK-7J, 7M 8
(HSI-M-12) 1.29-64D HCV-323 S.I. High Pressure Auxiliary SIAS ESK-7M, 7J 8
(HSI-M-22)
Hdr to Loop 2 1.29-64D HCV-333 S. I. High Pressure Auxiliary SIAS ESK-7M, 7J 8
(HSI-M-32)
Hdr to Loop 3 1.29-64D ]
4, ENCLOSURE 1 TABLE I (2.0) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f HCV-301 Charging Pump Outlet to SIAS ESK-7M, 7J 8
(HSI-M-41)
Auxiliary H. P. Hdr 1.29-60D HCV-254 Charging Line Stop Valve SIAS ESK-7M, 7K 8
(CH-A-33) 1.29-35C HCV-255 Charging Line Stop Valve SIAS ESK-7M, 7K 8
(CH-A-32) 1.29-35C PCV-211 Seal Wtr Pressure Control SIAS ESK-7K, 7M 8
(SL-P-3) for RCP (Close on SIAS) 1.29-29C HCV-311 SIS High Pressure SIAS ESK-7K, 7M 8
(HSI-M-11)
Hdr to Loop 1 1.29-64D HCV-321 SIS High Preseure Hdr SIAS ESK-7K, 7M 8
(HSI-M-21) to Loop 2 1.29-64D HCV-331 SIS High Pressure Hdr SIAS ESK-7K, 7M 8
(HSI-M-31) to Loop 3 1.29-64D HCV-302 Charging Pump Outlet to SIAS ESK-7K, 7M 8
(HSI-M-42)
H. P. Header 1.29-60D ENCLOSURE 1 TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f HCV-242 Letdown Isolation Valve to SIAS ESK-7K, 7M 8
(LD-M-2)
Regen HX E-67 1.29-61C FCV-212 Charging Flow Control Valve SIAS ESK-7K, 7M 8
(CH-F-38) 1.29-31A HCV-314 Safety Injection Tank Fill SIAS ESK-7J, 7M 8
(SIA-A-12)
Valves (Close on SIAS) 1.29-28C HCV-324 Safety Injection Tank Fill SIAS ESK-7J, 7M 8
(SIA-A-22)
Valves (Close on SIAS) 1.29-28C HCV-334 Safety Injection Tank Fill SIAS ESK-7J, 7M 8
(SIA-A-32)
Valves (Close on SIAS) 1.29-28C SOV-40088 Vac Sys Charging Pump SIAS ESK-7J, 7M 8
(CH-S-120)
Isolation Valve LCV-204V volume control Tank to Charging SIAS ESK-7L 3, 8 PPS Isolation Valve 1.29-105B LCV-204S Volume Control Tank to SIAS ESK-7L 3, 8 Charging PPS Isolation Valve 1.29-105B FCV-216 Charging PPS to Loop Fill SIAS ESK-7L 3, 8 Header Isolation 1.29-66D FN-44A,B Spray Pump Room Exhaust SIAS ESK-7L, 6CK 8
Fan ENCLOSURE 1 TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f MOV-3211 "A" Train Inlet Header Stop CSAS A ESK-7B, 6BN 3, 7 (CS-M-1) to Spray Ring MOV-3212 "B" Train Inlet Header Stop CSAS B ESK-7B, 6BN 3, 7 (CS-N-2) to Spray Ring MOV-3213 Spray Chemical to RWST CSAS A ESK-7B, 6BR 3, 7 (CS-N-66)
MOV-3214 Spray Chemical to RWST CSAS B ESK-7B, 6BR 3, 7 (C5-M-71)
TV-3412 RC Air Recire Coola s Outlet CSAS B ESK-7B 3, 7 (PCC-A-238)
Header Trip Valve TCV-1720 Hydrogen Coolers Outlet CSAS B ESK-7B 7
(SCC-T-227)
Temperature Control TCV-1721 Turbine 011 Coolers Outlet CSAS B ESK-7B 7
(SCC-T-257)
Temperature Control i
ENCLOSURE 1 TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f TCV-1722 Electro Hydraulic 011 Coolers CSAS B ESK-7B 7
(SCC-T-315)
Temperature Control MOV-1701 Residual Heat Exchanger RAS ESK-7F, 6BK 3, 9 (SCC-M-165)
E-3B Outlet MOV-3202 LPSI PP Return to Refuel Tk RAS ESK-7E, 6BQ 3, 9 (SIA-A-53)
Safeguard Recire. Stop to RWST MOV-3204 LPSI PP Return to Refuel Tk RAS ESK-7F, 6BQ 3, 9 (SI-A-54)
Safeguards Recire. Stop to RWST MOV-3205 Refuel Water Tank Outlet to RAS ESK-7E, 6BP 9, 10 (LSI-M-41)
Safeguards Pumps (B train)
MOV-3206 Refuel Water Tank Outlet to RAS ESK-7F, 6BP 9, 10 (LSI-M-40)
Safeguards Pumps (A train)
MOV-3207 Containment Sump RAS ESK-7E, 6BP 9, 3 (CS-M-91)
MOV-3208 Containment Sump RAS ESK-7F, 6BP 9, 3 (CS-M-91)
MOV-3209 Res Heat Exchanger c., Charging RAS ESK-7E, 6BN 9, 3 (hSI-M-54)
Pumps
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ENCLOSURE 1 TABLE I (2.1) (Cont.)
Reference to Component Description Control Circuitry (Valve Numbers)
System Service Safety Function 11550-Notes 2.1.a 2.1.b 2.1.c 2.1.e 2.1.d&f MOV-3210 Res Heat Exchanger to Charging RAS ESK-F, 6BN 9, 3 (HSI-M-55)
Pumps MOV-3401 Residual Heat Exchanger RAS ESK-7E, 6BK 9, 3 (PCC-M-43)
MOV-3402 Primary Component Coolant Water RAS ESK-7E, 6BL 9, 3 (PCC-M-90)
Inlet to Aux Bldg MOV-3403 Primary Component Coolant Water RAS ESK-7E, 6BL 9, 3 (PCC-M-150) to RC Heat Exchanger SOV-3217A Air Control to FCV-3217A RAS 7E 9, 3 FCV-3217A-Vent Header to Containment SOV-3217B Air Control to FCV-3217B RAS 7F
1.29-104B
ENCLOSURE 1 TABLE 1 NOTES:
1.
Valve may be opened only manually after ESF Trip but will reclose when valve control pushbuttons are' released.
2.
See Section 7.3.4 of the Maine Yankee YSAR. Changes per NUREG 0578, which prevent any CIS valve from reopening on a CIS reset, are documented in our March 5, 1980 letter (WMY-80-39) to the NRR.
3.
Valve cannot be returned to normal (pre-trip) condition without reset of the actuation signal.
4.
These valves are also tripped on a High Radistiot. Signal as shown on referenced drawings and described in our December 29, 1978 letter.
5.
CIS - Containment Isolation Signal. See Section 7.3.4 of the Maine Yankee FSAR.
6.
CIS/SIAS - See March 5, 1980 letter (Note 2), " Diverse Actuation of Non-Essential Containment Isolation Valves".
7.
CSAS - Containment Spray Actuation System. See Section 7.3.3 of the Maine Yankee FSAR for circuit description.
8.
SIAS - Safety Injection Actuation Signal. See Section 7.3.2 of the Maine Yankee FSAR for circuit description.
9.
RAS - Recirculation Actuation Signal. See Section 7.3.2 of the Maine Yankee FSAR for circuit descrip' tion.
l ENCLOSURE 1 i
10.
The RAS signal to valve may be overridden manually, prior to or after trip, by use of a control switch located in the main control room.
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ENCLOSURE 1 QUESTION 2.(2): For each manual bypass or override feature identified in 2(1) above, provide a description of the physical feature (s) provided to prevent inadvertent operation and to satisfy the requirements of IEEE Std. 279-1971, Section 4.14.
ANSWER:
The present design uses administrative controls and annunciation coupled with some physical features to prevent inadvertent operation of all manual bypass or override features, identified in 2(1). These are automatic removal of manual blocks (Sections 7.3.2, 7.3.3 and 7.3.4 of the FSAR) and dissimilar control handles located at specific panels designated as SIAS, CIS or CSAS panels.
QUESTION 2.(3): For each actuation signal system and component actuation system identified in 2(1)d and 2(1)e above, incorporating a manual reset, override or bypass feature, provide a complete circuit description, including detailed pictorial information (i.e., as built circuit diagram, schematics, logics), sufficient to allow a thorough understanding of the operation of such circuitry including the function and effect of all control devices (e.g., relays, contacts, switches, diodes, etc.).
ANSWER:
Referenced prints used in response to 2.1.e contain sufficient information to address this question.
QUESTION 2.(4): For each actuation s'ignal identified in 2(1) above, identify the design standards, quality assurance requirements, and.._....__.
ENCLOSURE 1 component qualification standards involved to ensure that the systems will perform their designated safety function upon demand.
ANSWER:
The ESF initiation, control and power supply systems we designed in accordance with proposed IEEE Criteria No. 279, dated August 1968, so that no single fault in components, units, channels or sensors will prevent ESF operation.
Also, Criterion 15 of the AEC General Design Criteria is met (Appendix A of FSAR).
Quality assurance standards used for each actuation signal are documented in Appendix B of the Maine Yankee FSAR.
The Component Qualification Standard used was proposed IEEE 279, dated August 1968. This standard was used as a guideline during design and installation of the ESF system.
Recent upgrade of the ESF actuation equipment (per Item 2.1.4 of NUREG 0578) has followed IEEE standard 279-1971 i
and IEEE 344-1975. This is documented in our response to Bulletin 79-91A.
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ENCLOSURE 2 o
Elementary Diagram - Auxiliary System Controls, Sheets 9 thru 12; Numbered SK-7J, 7K, 7L, and 7M Elementary Diagram - Auxiliary System Controls, SH 3; ESK-7C, Sheets 1 and 2.
Elementary Diagram - Auxiliary System Controls, SH 4; ESK-7D, Sheets 1 and 2.
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