ML20062H071
| ML20062H071 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/26/1990 |
| From: | SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | |
| Shared Package | |
| ML20062H068 | List: |
| References | |
| NUDOCS 9012040079 | |
| Download: ML20062H071 (8) | |
Text
m 5
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. to Document Control Desk letter November 26, 1990 i
Page 1 of 5 i
PROPOSED TECHNICAL SPECIFICATION CHANGE - TSP 890016 VIRGIL C. SUMMER NUCLEAR STATION
)
LIST OF AFFECTED PAGES
]
r Paae Description 3/4 8-1 3.8.1.1 Action a.1 and b.1 Editorial change
-3/4 8-2 3.8.1.1 Action col Editorial change f
3/4 8-2a 3.8.1.1 Action e.1 and 4.8.1.1.1.2 Editorial change 3/4 8-3 4.8.1.1.1.b Deleted f
901?O40079 9021;g DR eqCN 33 00< r- ' =;
Pln.
-.n f
3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES y
OPERATING
\\
LIMITING CONDITION FOR OPERATION
- 3. 8.1.1 As a minimum, the following A.C. electrical power t
OPERABLE:
k sources shall be network end the onsite Class 1E distribu a.
s te transmission b.
Two separate and independent Emergency Oiesel Gen
, and with:
erators (EOG), each 1.
gallons of fuel,A separate day fuel tank containing a mini ume of 300 2.
47,100 gallons of fuel, andA separate fuel storage s um volume of 3.
A separate fuel transfer pump.
APPLICABILITY:
MODES 1, 2, 3 and 4.
ACTION:.
With cu r"fsite circuit of 3.8.1.1.a inoperable:
a.
.q 1.
Demonstrate the OPERABILITY of the remaining offsit within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> e A.C.
2.
24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, demonstrate its OPERABILIT er, and e past
. Surveillance Requirement 4.8.1.1.2.a.3 separately EOG within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 841ess the diesel is already oper t 3.
Restore the offsite circuit to OPERABLE status a ng, and
'l SHUTOOWN within tne following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />,or be n 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> b.
With 'one EDG of 3.8.1.1.b -inoperable:
1.
performing Surveillance Requirement 4.8.1.1 and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and within 1-hour 2.
If the EOG became inoperable due to any cause other than OPERABILITY of the remaining EDG by pe e
Requirements 4.8.1.1,2.a,3 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
- ce
, and "This test is required to be completed regardless of when th is restored to OPERABILITY.
e inoperable EDG SUMMER - UNIT 1 3/4 8 1 AMENOMENTNO.//.\\
-m m-m
./
y
' [!MITINGM CON 0!T MA ION Foe OPERAT (Contin lDN ued) 3 wi tr inthin 2 a
hour s
s as compon,tsverify that a s 2, or 3our en ce of and OPERA 8, that em r
If the Tuergencydevices thatequir d LE.
be in e
system, subsyst SHUTOOWN wiat least power these *o diticin Driv depend s
e are HOT c n e
4 n Emergen y Fealso OPERABL on the Restor thin the folAN08Y ons ST
- Hat,
r em ining EOG are least HOTe the EDG lowing 30 a
wi c
thin the n t satisfieded Pump is o
nd wi in MODE thin the follSTAN08Yto OPERA 8LE c.
hour.next Wi 1,
th one s
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> wi wi thin 2 offsi o ing 30 thin the statu w
and hours s
te hour,next 6 ho within 7 in COLD Demonstrate th circuit urs ho s
2 s
and ource by urs and on e EOG in CO or be in wi performing !e OPERABILITY thin LD in per ble:
2 o
o SHV at ne ho a
%WN If ur of the EDG and
,ua the lea t onveillanc Req pr at eplan r
RequirOPERASILITYn d prbecame in pe em ining offsi a
s e
e uir ce per 8 ev o
ement e tive n
m intenancr ble due to urs ther.1.1 1 ho 48 te A.C a
of 3
em the et n 4 8 1.1 2 a
Wi remaining EDG thin any caus eafter#
tr ins, 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> e
or testing,e 2, or 3, eourc.apone,ntsverify that4 3 within 8 a
, and s
et by as other than perforsing S desvistrate t of hours
- OPERABLE. that emergency and requir d syst ur devices that
, and veillanc he be in the Turbine D e
power at If e
a SHUTDOWN withleast thes ems e
are depend on,ths bsystems, also OPERABLE a NOT condi riv 4
u Re tor in the folloAN08Ytio en Em ST s
ns e
ergen y feed Pu rem ining EDG e
are 12 a
c nd ho one wi wing 30 thin the not satisfied wi in MODE urs of and the in per bl S.
in COLDor be in mp is 1,
hours.next o
6 ho thin 2 Restor SHUT 0OWN wi at le a
urs e
ast sourc and ho Hot et urs generator)heto OPERA 8LE sother A.C. powethin the foll in COLD,
of Section 3.8 owing 30within the status with the tim tim r
1.1 so e
Action Statemtatus inurce (offsi hour,ne t x
wi s
6 thin of e r sour initial equir te and ho ce.
urs accordance ement loss cir of of ent "T
cuit or diesel ishis test the that
- a. or b.,with Action Statem the provisio r
emaining inoper is as restor d able A. based on theap r priate requir d po e
ent to OPERABILITto be e
C. power SUI 9tER UNIT completed r Y.
1 egardless of when the in p o
3/4 8-2 er ble EDG a
AMEN 0 MENT NO. k
,s
,/
p
.f ILEctRICal POWER SYSTECS 1
LIMITING CONDITION FOR OPERATION ACQQ8l: (Continued)
C
=
3.
Within 2' hours, verify that required systems trains components and devices that depend on the remaini
, subsystems, as a source of emergency power are also 0PERA8LE and ng EOG
- 2. or 3, that the Turcine Driven Emergency Feed Pump is OPERA 8LF.
be in at least HOT $7AN08Y within SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
4.
Restore the E00 to OPERA 8LE status within 7 least NOT STANC8Y within the oext 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> a within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, With one offsite circuit and one EDG inoperable:
c.
- 1..
Demonstrate the OPERA 8tLITY of the remaining offsite A C source by performing Surveillance Requirement 4.8.1.1.1 within one hoid and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter
, and 2.
If the EDG became inoperable due to any cause other than OPERA 81LITY of the remaining EDG by pe Requirement 4.8.1.1.2.a.3 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />", and 3.
Within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, verify that required systees as source of emergency power are also OP
, subsystems,
- 2. or 3, that the Turbine Driven Emergency Feed Pump is OPERA 8LE.
be in at least NOT STAN08Y within the next 6 SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
4 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or be in at least HOT STAN08Y wit and in COLD SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, and 5.
Restore the other A.C. power source generator) to 0PERA8LE status in acco(offsite circuit or diesel t
of Section 3.8.1.1 Action Statement a. or b.,
as appropriate,rdance with the pro with the time requirement of that Action Statement based on the time of initial loss of the remaining inoperable A. C source.
. power "This test is required to be completed regardless of when the inoper is restored to OPERA 81LITY.
1.
SUP9tER - UNIT 1 3/4 8-2 AMEN 0MENTNO.\\
ELECMICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (Conti ued) k ACTION: (Continued) d.
With two of the required offsite A performing Surveillance Require 1.
o EOG's b within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, unless the EDG's are.8.1.1.2.y sequ a.3 on both i
2.
Restore one of the inoperable affsit already oper status within next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at le e sources to OPERABLE 3.
Following restoration of one offsite Statement a. with the time requirement based on the time of initial loss of thsource, follow of that Action Statement offsite A.C. circuit.
e remaining inoperable e.
With two of the above required EDG's i noperable:
1.
Demonstrate the OPERABILITY of two o performing Surveillance Requirement 4 8 1 1e A.C.
and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter
..1 within one hour 2.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STAN
, and i
ABLE status within and in COLD SHUTOOWN within the following 30 3,
following restoration of one EDG ours.
with the time requirement of that A
'ollow Action Statement b.
s generator.
e ciesel SURVEILLANCE REOUIREMENTS 4.8.1.1.1 Each of the above required the offsig transmission network and thphysically indepen sha j
e onsite Class 1E distribution system l getermined OPERABLE at least once pe breaker alignment and indication of powe Claas 15 Sud and its gased (,wu's Mr availabi
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SUMMER - UNIT 1 3/4 6-2a AMENDMENT N0. K 1
I 1
~
ELECTRICAL POWER SYSTEMS
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4'
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SURVEILLANCE REQUIREMENTS (Continued) e t
~
b.
M' Demons " ed OPE
~
~
E at le once e the a 18 mon by manua ate r
t.
4.8.1.1.2 Each ED'G shall be demonstrated OPER STAGGERED TEST BASIS by:In accordance a.
n Table 4.8 1 on a 1.
Verifying the fuel level in the day tank 2.
fuel from the storage system to the da and fuel stcrage tank.
e started and transfers 3.
Verifying the diesel genera y tank.
synchronous speed (504 rpm) tor can start
- and accelera at 7200 t 720 volts and 60 with generator voltage and freq 4
1.2 Hz, Verifying the generator is s an indicated 4150-4250 kW** ynchronized, gradually loaded
- to b.
where the period of operation was grea by removing accumulated water from the d peration of the diesel r than or equal to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> c.
By obtaining a sample of fuel oil in acc ay tank.
to the storage tanks and verifying that th following minimum requirements and is t on of new fuel oil time limits:
e sample meets the ested within the specified 1.
As soon as sample is taken storage tank) verify in acco(or prior to adding new fuel ASTM-0975-77that the sample has:rdance with the tests specifi a) volume percent.A water and sediment content of n or equal to 0.05 b)
A kinematic viscosity 9 40'C of greater th 1~.9 centistokes, but less than or equal t an or equal to c)
A specific gravity as specified by the o 4.1 centistokes.
60/60'F of greater than or equal to 0 83 b t l manufacturer 9 equal to 0.89 or an API gravity 9 60*F of gre t u
equal to 27 degrees but less than or equal to 3 ess than or a er than or degrees.
- This test shall be conducted in accorda ing loading recommendations.tions regarding engine p nce with the manufacturer's rec up procedures, and as applicable rega
- This band is meant as guidance to avcidLoa routine overloading of the engine.
validate the test.
l SUMMER - UNIT 1 3/4 8-3 AMEN 0 MENT NO. g
n
. to Document Control Desk Letter November 26 1990 Page 1 of 1 PROPOSED TECHNICAL SPECIFICATION CHANGE TSP 890016 VIRGIL C. SUMMER NUCLEAR STATION DESCRIPTION AND SAFETY EVALUATION l'ESCRIPTION OF CHANGE SCE&G proposes to modify the VCSNS technical specifications (TS) to revise TS 4.S.1.1.1.
The proposed change deletes surveillance requirement 4.8.1.1.1.b. The intent of the surveillance requirement is to demonstrate operability of the offsite, preferred power sources. This surveillance requirement is.not applicable to VCSNS based on the design configuration and mode.of operation of the offsite power supply system.
SAFETY EVALUATION Two separa h and physically independent sources of offsite power (normal circuit) provide preferred AC power to the class 1E electric power system.-
One source, the 230KV transmission grid, normally supplies power to bus B, and the second source, the 115KV transmission line from the Parr generating complex, supplies-power to bus A.
(Reference FSAR Figure 8.2-3, " Balance of Plant Power System," and Figure _8.2-4, " Engineered Safety features Power System.")
'Either independent source is capable of providing power to both buses by manually switching the breakers connecting the class 1E buses to the transmission-line. The connection of the safety buses to a single offsite power source is intended as a maintenance feature to service the breakers, rather than an operational feature.
The two independent power supply sources (normal circuit) are continuously connected to provide power to their designated bus through an Engineered Safety Feature (ESF) transformer or an emergency auxiliary transformer.
In
-the event-.of a loss-of one of the offsite power sources, the onsite diesel generator for the affected class 1E bus will automatically start, and after the bus is isolated from its offsite power source, it will supply emergency power to that bus. The other class 1E bus remains continually fed from its independent source without interruption. The installed offsite power supply system does not have an " alternate" power supply circuit.
The two offsite power sources have adequate separation and isolation such as to preclude degradation of one source upon the loss or failure of the other.
l Adequate indication on the main control board is provided to monitor the l
class 1E buses operating levels.
e to Document Control Desk letter November 26, 1990 Page 1 of 2 PROPOSED TECHNICAL SPECIFICATION CHANGE - TSP 890016 VIRGIL C. SUMMER NUCLEAR STATION DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATION DESCRIPTION OF CHANGE SCE&G proposes to modify the VCSNS technical specifications (TS) to revise TS 4.8.1.1.1.
The proposed change deletes surveillance requirement 4.8.1.1.1.b.
The intent of the surveillance requirement is to demonstrate operability of the offsite, preferred power sources. This surveillance requirement is not applicable to VCSNS based on the design configuration and mode of operation of the offsite power supply system.
SIGNIFICANTHAZARDS EVALUATION SCE&G has evaluated the proposed technical specification change and has determined that it does not represent a significant hazard consideration based on the criteria established in 10 CFR 50.92. Operation of Virgil C.
Summer Nuclear Station in accordance with the proposed amendment will not:
(1) involve a significant increate in the probability or consequences of an accident paeviously evaluated.
The function of the offsite pt.wer supply system as described in the FSAR-section 8.2.and the function of the onsite A-C power system as described in FSAR tection 8.3.1 remain unchanged. The two independent off.ite power supply sources normally supply preferred AC power to the class 1E ESF buses through stepdown transformers. These two sources have adequate separation and isolation to preclude any single failure from degrading the ESF AC power system. The intent of the surveillance requirement to demonstrate operability of the offsite power. sources is met on a continuous basis. VCSNS does not have an " alternate" offsite power supply source.
Therefore, the requirement to transfer the unit power supply to the alternate circuit'is not applicable. The proposed TS change does not affect the probability or consequences of a previously evaluated accident.
e.
4' a
, to Document Control Desk letter November 26, 1990 Page 2 of 2 (2) create the possibility of a new or different kind of accident from any previously analyzed.
The as-built ele:trical distribution system does not physically change. or change its operation, as a result of the proposed TS change. Offsite power supply automatic transfer from a normal circuit to an alternate circuit was never intended since the offsite power system normally and continuously supplies power to the ESF buses.
Therefore, the proposed change will not create the possibility of a new or different accident.
l (3) involve a significant reduction in a margin of safety.
Deletion of surveillance requirement 4.8.1.1.1.b does not affect the configurat' von or operation of the offsite power supply system. The offsite AC power supply system, designed to provide sufficient capacity, redundancy and reliability to ensure availability of power to the ESF system, remains unchanged. The basis of the system design, " provide at least one single offsite circuit capable of powering the ESF loads,"
is not affected by the proposed change. The proposed change does not reduce the margin of safety.
.