ML19323G372
| ML19323G372 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 05/28/1980 |
| From: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| WVY-80-81, NUDOCS 8006020274 | |
| Download: ML19323G372 (12) | |
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VERMONT Y AN KEE NUCLEAR POWER CORPORATION e
SEVENTY SEVEN GROVE STREET B.3.2.1 WVY 80-81 RUTI.AND, VERMONT 05701 REPLY TO:
ENGINEERING OFFICE TURNPIKE RO AD WESTDORO, M ASS ACHUSETTS 01581 TELEPHONE 617 366 9011 May 28, 1980 United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention: Office of Nuclear Reactor Regulation Mr. T. A. Ippolito, Chief Operating Projects Branch #2 Division of Project Management
References:
(a)
License No. DPR-28 (Docket No. 50-271)
(b)
Letter, T. A. Ippolito (USNRC) to R. L. Smith (VYNPC) dated bbrch 12, 1980
Subject:
Response to NRC Request for Additional Information for Bypass and Reset of Engineered Safety Features for Vermont Yankee
Dear Sir:
Reference (b) requested that Vermont Yankee provide the subject response. Subsequent discussions with members of your staff have resulted in reducing the amount of detailed pictorial information to be submitted to only those drawings related to the containment purging and venting system at Vermont Yankee. Due to security concerns regarding the information contained in these drawings, they are being forwarded by a separate submittal. The remaining information requested in Reference (b) is contained in the attachment to this letter.
We trust this information will be satisfactory; however, should you have any further qu'-M ons, please contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION j
ss R. L. Smith Licensing Engineer RLS/smw l
Attachment 1
8 00602 0M f
i
Subject:
Response to NRC Questions on Electrical Override / Bypass Aspects of ESF Systems Question 1:
Criterion 1 -
No exceptions. Refer to FSAR paragraphs 7.3.3.7b and 7.3.5; also, see response in our January 9, l
1979 letter to the NRC.
Criterion 2 -
Refer to Question 2.2.
Criterion 3 -
No exceptions. Refer to FSAR paragraph 7.3.3.9b.
Criterion 4 -
The containment ventilation system is not isolated upon a containment high radiation signal. No i
containment high radiation signal exists, however, main steam line high radiation will initiate isolation of all main steam lines, main steamline drain, and reactor water sample lines, and reactor building ventilation exhaust high radiation signal will initiate isolation of the containment ventilation system. Refer to FSAR Section 7.3.4.7 paragraphs 2 6 13.
Criterion 5 -
This is addressed in the response to IE Bulletin No.79-01B.
Criterion 6 -
This will be addressed in the response to IE Bulletin No. 80-06.
Question 2:
(1) See Table 1.
(2) The present design uses administrative controls and annunciation 1
coupled with some physical features to prevent inadvertent operation of all manual bypass or override features, identified in 2 (1). These include keylock switches and multiple step sequential manual actions.
(3)
Referenced prints used in response to 2.1.e and Table 2 (system logic prints) contain sufficient information to address this question for the purge and vent system at Vermont Yankee.
(4) Tne ESF initiation, control and power supply systems were designed in accordance with FSAR paragraphs 7.3.3 and 7.4.2.
Quality assurance standards used for each actuation signal are documented in Appendix D of the Vermont Yankee FSAR.
The component qualification standards are addressed in response to IE Bulletins79-01A and 79-01B.
TABLE 1 ENGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 1 0F 9
' COMPONENT ACTUATION CONTROL BYPASS /0VERRIDE
' DESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES Inboard Valves PCIS Main Steam Line Close on:
803, 806, 810 Low MSL pressure A0-V2-80A Isolation Valves a) Reactor Vessel Low-Low H O 813, 1108, 1119, bypass when mode 2
A0-V2-80B (MSIV) b) High Radiaton - MSL 1110, 1111 switch not in run A0-V2-80C c) Low MSL Pressure A0-V2-80D Position switches d) High Steam Flow (normal &
730E833 SH.7 Startup range bypassed Outboard Valves on these valves startup range) when mode switch an run.
A0-V2-86A cause a scram when e) Condenser Low Vacuum 730E833 SH.8 Low vacuum bypassed
.AO-V2-86B-valves close f) Main Steam Line Area when mode switch in A0-V2-36C Temperature High positions other than run.
A0-V2-86D V16-20-22A PCIS Torus N2 Makeup Closes on:
1113 High radiation signal Inlet Valve a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation V16-20-22B PCIS Drywell N2 Makeup Closes on:
1113 High radiation signal Inlet Valve a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation V16-19-10 PCIS Torus Air Purge Closes on:
1117 High radiation signal Valve a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation
w o
[NGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 2 ' OF 9 UOMPONENT ACTUATION CONTROL BYPASS /0VERRIDE pESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES
- V16-19-7A PCIS Drywell Purge Closes on:
1117 High radiation signal Outlet Valve a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation V16-20-20 PCIS Drywell & Torus Closes on:
1116 High radiation signal hakeup N2 inlet a) High Drywell Pressure manual override in Valve b) Reactor Vessel Low water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation
- V20-94 PCIS Drywell Equip.
Close on:
1114 No override V20-95 Drain Discharge a) Reactor Vessel Low Water &
1115 Valves b) Drywell High Pressure
.V20-82 PCIS Drywell Floor Drain Close on:
1114 No override V20-83 Discharge Valves a) Reactor Vessel Low Water &
1115 b) Drywell High Pressure V16-19-7B PCIS Torus Vent Valve Closes on:
1117 High radiation signal a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation V72-38A,B PCIS Cont. Air Compressor Closes on:
1116,1113 High radiation signal Suction Valve a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation
- NGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 3-OF 9
[0MPONENT ACTUATION CONTROL BYPASS /0VERRIDE iESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES
'V16-19-6A PCIS Torus 2" Vent Closes on:
1117,1113 High radiation signal V16-19-6B Relier Valve a) High Drywell Pressure
~
manual override in Drywell 2" Vent b) Reactor Vessel Low Water MCR (for either 1 of 2 Relief Valve c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation V16-19-8 PCIS Drywell Purge Closes on:
1117 High radiation signal Inlet Valve a) High Drywell Pressure manual override in b) Reactor Vessel Low Water MCR (for either 1 of 2 c) Reactor Bldg. Vent High signals only)
Radiation or Refuel Floor High Radiation
,V12-15 (Inboard)
RWC Reactor Line Valves Closes on:
909 No override V12-18 (Outboard)
(PCI) a) Reactor Vessel Low H O 730E833 SH2O 2
b) Standby liquid control 910 System On V12-68 (Outboard) RWC Reactor Line Valve Same as above 911 No override (PCI) 730E833 SH10 V10-57 (Outboard) RHR Discharge to Rad.
Close On:
V10-66 (Inboard)
Waste Valves a) Drywell High Pressure 1312 No override b) Reactor Vessel Low H O 1313 2
V10-25A RHR Inboard Injection Open On:
1271 High drywell signal
- V10-25B (LPCI)
Valves a) High Drywell Pressure or manual override in b) Reactor Vessel Low-Low MCR Water Level &
Reactor Pressure Low V10-39A RHR Suppression Close On:
1283 Manual override V10-39B Cham er Spray a) High Drywell Pressure 1282 in MCR Upstream Valves b) Reactor Vessel Low Water c) Reactor Pressure Low V10-31A RHR Inboard Injection Close On:
1276, 1277 Manual override V10-31B Valves a) High Drywell Pressure in MCR b) Reactor Vessel Low-Low Water Level
?NGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 4.
OF 9.
JOMPONENT ACTUATION CONTROL BYPASS /0VERRIDE
)ESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES V10-32 (Inboard)
RHR Isolation Valves Close On:
1310, 1311 No override V10-33 (Outboard) a) Drywell High Pressure or 1308, 1309 V10-17 (Outboard) b) Reactor Vessel Low Water with
-V10-18 (Inboard) c) Reactor Pressure 100 psi V10-27A RHR Outboard Injection Open on:
1273 No override V10-27B (LPCI)
Valves a) Drywell High Pressure or 1272 b) Reactor Vessel Low-Low Water &
Reactor Pressure Low V10-26A RHR Outboard Injection Close On:
1274 Manual override V10-26B Valves a) Drywell High Pressure 1275 in MCR b) Reactor Vessel Low Water c) Reactor Pressure Low V10-34A RHR Suppression Chamber Close On:
1277 Manual override V10-340 Sprny Bypass Valve a) High Drywell Pressure 1278 in MCR b) Reactor Vessel Low Water Level V10-38A RHR Suppression Chamber C)ose On:
1281 Manual override V10-388 Spray Valve a) High Drywell Pressure 1280 in MCR b) Reactor Vessel Low Water Level V10-65A RHR Heat Exchanger opens on:
1285 No override V10-65B (LPCI)
Bypass Valves a) High Drywell Pressure or 1284 b) Reactor Vessel Low-Low Water &
Reactor Low Pressure V23-57 HPCI Pump Suction Valve Close on:
1444 High steam line flow V23-58 from Suppression a) High Steam Line Area 1446 override in MCR (for Chamber Temperature testing).
b) High Steam Line Flow c) Low Steam Supply Pressure Low steam line supply pressure override in MCR (warm-up turbine during startup)
IGINEERED SAFETY FEATURES VALVES'& DAMPERS SHEET 5 or 9
')MPONENT-ACTUATION CONTROL BYPASS /0VERRIDE
?SIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES
-J'23-21 HPCI Test Return Valve Close on:
1443 No override 123-24 a) High Drywell Pressure 1445 b) Reactor Vessel Low-Low Water Level
. 23-19 HPCI Pump Discharge Open on:
1440 No override
./23-20 Valves a) High Drywell Pressure 1441 b) Reactor Vessel Low-Low Water Level 23-39 HPCI Steam Line Drain Close when valve V23-14 opens 1447 No override 33-40 Isolation Valves
'.?3-42 33-43 123-25 HPCI Minimum Flow Bypass Opens on:
1442 No override Valve.(to Low Discharge Flow suppression chamber) and High Drywell Pressure or Reactor Vessel Low-Low Water Level
/23-15 HPCI Turbine Steam Supply Open on:
1436 No override on 123-16 Isolation valves a) Reactor Vessel Low-Low H O 1437 open function 2
b) Drywell High Pressure Close on:
a) High Steam Line Space Temp.
High steam line flow b) High Steam Flow override in MCR (for c) Low Steam Line pressure testing.
(HPCI line break)
Low steam line supply pressure override in MCR (warm-up turbine during start-up)
V23-14 HPCI Steam to Turbine Open on:
1439 No overtide Valve a) Reactor Vessel Low-Low H O 2
b) Drywell High Pressure c) MSL Space High Temperature
NGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 6' OF 9 OMPONENT ACTUATION CONTROL BYPASS /0VERHIDE ESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY
_FESTURES
.V23-17 HPCI Pump Suction From Open on:
1438 No override Condensate Storage a) Reactor Vessel Low-Low H O or 2
Tank b) Drywell High Pressure provided c) Valves V23-57 & 58 are closed lV13-18 RCIC Pump Suction From Opens on:
1190 No override
. Condensate Storage Reactor Vessel Low-Low J.'ater Tank Valve Level V13-20 RCIC Pump Discharge Open on:
1191 No override V13-21 Valves Reactor Vessel Low-Low 1192
' Water Level V13-30 RCIC Test Bypass to Closes on:
1194 No override Condensate Storage Reactor Vessel Low-Low Water Tank Valve Level V13-132 RCIC Turbine Cooling Opens on:
1198 No override HO Reactor Vessel Low-Low Water 2
Supply Valve Level V13-131 RCIC Steam to Turbine Opens on:
1197 No override Valve Reactor Vessel Low-Low Water Level V13-12, 13
-RCIC Condensate Pump Close on:
1183 No override Isolation Valves Reactor Vessel Low-Low Water V13-34,-35 RCIC Steam Line Drain Close on:
1183 No override Isolation Valves Reactor Vessel Low-Low Water
- V13-15 RCIC Turbine Steam close on:
1188 High steam line flow V13-16 Supply Line a) High SL Space Temp.
1189 override in MCR (for Isolation Valves b) High Steam Flow testing).
c) Low SL pressure (all three indicative Low steam supply of a line break in RCIC pressure override in steam line to turbine)
MCR (warm-up turbine during startup).
ENGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 7 0F.9 COMPONENT ACTUATION CONTROL BYPASS /0VERRIDE DESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES Open on:
Reactor Vessel Low-Low Water Level V14-26A CS Test to Suppression Close on:
1169 No override V14-26B pool valves a) High Drywell Precsure 1156 b) Reactor Vessel Low-Low Water Level V14-11A CS Core spray discharge Open on:
1166 No override V14-11B valves a) Drywell High Pressure or 1153 V14-12A b) Reactor Vessel Low-Low Water 1167 (V14-12B Level &
1154 f
Reactor Low Pressure
/ RV2-71A ADS System Pressure Open on 752 Manual override RV2-71B Relief Valves Coincident Signals of:
753 in MCR RV2-71C (Auto Blowdown a) Reactor Vessel Low-Low H O 754 2
RV2-71D System) b) Drywell High Pressure 755 c) Core Spray or RHR Pump On LS/SB-12 SGT Isolation Valve Close on:
1429, 1429A High radiation signal LS/SB-ll (Common Inlet) a) Reactor Vessel Low-Low Water 1430 manual override in b) Drywell High Pressure MCR (for either 1 of 8 c) High Reactor Bldg. Vent signals only)
Radiation or Refuel Floor High Radiation LS/SB-7 SGT Drywell & Torus Close s :
1113 High radiation signal (PCIS)
Vent to Reactor a) Reactor Vessel Low-Low Water manual override in Building Exhaust b) Drywell High Pressure MCR (for either 1 of &
System Valve c) High Reactor Bldg. Vent signals only)
Radiation or Refuel Floor High Radiation LS/SB-$
SGT Discharge Isolation Close on:
1429 High radiation signal LS/SB-10 Valves a) Reactor Vessel Low-Low Water 1429A manual override in b) Drywell High Pressure 1430 MCR (for either 1 of 2 c) High Reactor Bldg. Vent signals only)
Radiation or Refuel Floor High Radiation
ENGINEERED SAFETY FEATURES VALVES & DAMPERS SHEET 8 0F 9
. COMPONENT ACTUATION CONTHOL BYPASS /0VERRIDE DESIGNATION SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES Open on:
1430 High radiation signal a) Reactor Vessel Low-Low 1429 manual override in
.LS Sb-2A, B SGT Exhaust Fan Water level MCR.
(for either 1 of Isolation Valve -
b) Drywell High Pressure 2 signals only). Fan Inlet c) High Reactor Bldg. Vent control manual override LS/SB-3A, B Exhaust Fan Radiation or Refuel Floor in MCR.
Isolation Valve -
High Radiation Outlet Valves actually initiated by Exhaust fane; fans are initiated by above signals LS/SB-1A, B SGT Isolation Valve Open on:
High Radiation signal (Common Inlet) a) Reactor Vessel Low-Low Water 1430 manual override in Level 1429 MCR (for either 1 of 2 b) Drywell High Pressure signals only) c) High Reactor Bldg. Vent Radiation or Refuel Floor High Radiation V2-53A Reciro.
Recirculation Pump Closes on:
Manual override V2-53B System Discharge Valves a) High Drywell Pressure or 736, 737 in MCR (for testing) b) Reactor Vessel Low-Low Water Level &
Reactor Low Pressure V2-54A Recire.
Recire. Pump Disch. Close on:
Manual override V2-54B System Bypass Valves a) High Drywell Pressure or 732, 733 in MCR (for testing) b) Reactor Vessel Low-Low Water &
Reactor Low Pressure V2-65A Recire.
Recire. Manifold Close on:
Manual override V2-65B System Cross-Tie Valves a) High Drywell Pressure or 734, 735 in MCR (for testing) b) Reactor Vessel Low-Low Water &
Reactor Low Pressure V2-66A Recirc.
Recire. Manifold Close on:
V2-66B System Cross-Tie Bypass a) High Drywell pressure or 738, 739 Manual override Valves b) Reactor Vessel Low-Low Water &
in MCR (fcr testing)
Reactor Low Pressure
y ENGI"EERED SAFETY FEATURES VALVES & DAMPERS SHEET ' 9 OF 9 00MPONENT-ACTUATION CONTROL BYPASS /0VERRIDE JESIGNATIO;'
SYSTEM SAFETY FUNCTION SIGNAL SOURCE CIRCUITRY FEATURES V2-39 Recire.
-Recire. Loop Close on:
.V2-40 System Sample Valve a) Reactor Vessel Low-Low H O 1118 Low MSL pressure 2
(PCIS)
.b) High Radiation MSL bypass when mode c) Hi flow - Normal & ' Startup switch not in run.
range Startup range d) Hi Flow - Normal & Startup bypassed in run low range vacuum bypass in e) Condenser Low Vacuum mode switch positions f) MSL Area Temperature High other than run.
FSO-109-75-A2 Sampling Outboard Close on coincident:
602, 600 Manual override FSO-109-75-B2
. System Isolation Valve a) High Drywell Pressure in MCR FS0-109-75-C2 Oxygen b) Reactor Vessel Low Water FS0-109-75-D2 Analyzer c) Reactor Bldg. High Radiation FS0-109-75-Al Sampling Inboard Closes on coincident:
603 Manual override FS0-109-75-B1 System Isolation Valve a) High Drywell Pressure in MCR FSO-109-75-Cl oxygen b) Reactor Vessel Low Water FSO-109-75-D1 Analyzer c) Reactor Bldg. High. Radiation s
h m_
O Table 2 Ch'D Drawings Containing Information on Purge 6 Vent Systems 833 1100 1101 1102 1103 1112 1113 1114 1115 1116 1117 1119 1429 1429A 1430 t