ML18138A076
| ML18138A076 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 02/08/1980 |
| From: | Schwnecer A Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8003170075 | |
| Download: ML18138A076 (6) | |
Text
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DEisenhut RVollmer Dockets Nos i~Gammi 11.-.
and 81 LShao Mr. w. L. Proffitt JRMiller BGrimes
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\\~Russel 1 TJCarter Senior Vice President, Power.*Qi?e:.rgti o~f:
Virginia Electric and Power Goqipr111.t......
- ~£B8UARY 8 J98ff Post Office Box 26666 Richmond9 Virginia 23261
' *:,e. *; *,
Dear Mr. Proffitt:
We have reviewed your letter.da:ted November 9, 1979, which *responded to our September 25, 1979, lette.r-r<=l~t~.d,tQ)u~ili~ry Feed~u~ter: ~ystems 11t the Surry Power Station, Unit:; __ ~qs *. 1 ctnq 2.
~Je find that._we. n~ed add-itional information before w~ :C,~1'.1-comp}et.e,ot.tr revjew of these-syste111s..
The enclosure lists the informc1ti_on_we ne~d and gives *our pq~jtions regarding certain recommendati_qm;.
The items in *ttJe. enclosure are num-bered to correspond with the _reco11111endations in our September 25, 1979 letter.
It. is requested that you provit;:Ie yqur respc:m~e within 3Q. days of. the date of receipt of this letter.
Enclosure:
Request for Additional Information cc w/enclosure:
Sec next page Sincerely,
- Orlginal_,Signed ay A. Schwencer, Chief Operating Reactors Branch #1;, *:~*
Divisio[ of Operating Reactor~
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NRC FORM 318 (9-76) NRCM 0240
..:ru.s. GOVERNMENT PRINTING OFFICE: 1979-289-369
i Dockets Nos. 50-280 and 50-281 -
Mr. w. L. Proffitt e
y' UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 8, 1980 Senior Vice President, Power Operations Virginia Electric and Power Company Post Office Box 26666
. ~ichmond, Virginia.23261
Dear Mr. Proffitt:
e We have reviewed your letter dated November 9, 1979, which responded to our *September 25, 1979,- letter related to Auxiliary Feedwater Systems at the Surry Power Station, Units Nos.land 2..
We find that we need add-itional information before we can complete o~r review of these systems.
The enclosure lists the information we need and gives our positions regarding certain reconnnendations.
The items in the en~losure are num-
. bered to correspond with the recormnendations in our September 25, 1979 letter.
It is requested that you provide your response within 30 days of the date of receipt of this letter.
Enclosure:
Request for Additional Information cc w/enclosure:
See next page SincerelY.,
0.4d~
A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
I e
Mr. W *. L. Proffitt Virginia Electric and Power Company cc: Hr. Michael W. Maupin Hunton and Williams Post Offic~ Box 1535 Rich:nond, Virginia 23213 Swem Library College of William and Mary Williamsburg, Virginia 23185 Dona 1 d J. Burke U. S. Nuclear Regulatory Commission Region II Office of Inspection and Enforcement 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 e
February 8, 1980
i I
e REQUEST FOR ADDITIONAL INFORMATION ON
- sURRY POWER STATION UNITS 1 & 2
'AUXILIARY'FEEDWATER'SYSTEM.REQUIREMENTS Enclosure A.
Short Term*Recommendations
- 5.
Recommendation (GS-7)
Although. you have verified that the auxili.ary feedwater (AFt~) system auto-.
matic initiation signals and circuitry are safety grade; we required additional information in order to perform an independent review and veri-fication.
Youshou11d provide sufficient detailed information including elect~ical diagrams or provide a reference*to the sections of the FSAR where the detailed informat1on can be found that will allow an indepen-d.ent verification.
We need the detailed information before we can verify that the Surry AFW automatic initiation system meets safety grade require-ments.
B.. Additional Short Term Recommendations
- 1.
In addition to the redundant level indication you have proposed, a redun-dant low level alarm should also be included* in the design.
We request that you commit to the following requirements regarding the indication and alarm.
- a.
The level indications should be redundant all the way from the detectors to the readouts and alarms inside the control room.
- b.
Power supplies for the indication and alarm should also be redundant.
Use of non-Class 1,E circuitry is acceptable.for the short term provided o.rie power train has a back-up battery source.*
- c.
In the long term (1/1/81) the entire water level indication and alarm
- systems. should be designed 'to safety grade requirements including the.
use of Class lE circuitry and power supplies since the emergency conden*-
sate storage tank is designed to seismic Category I. requirements..
- 2.
Your.response to this recommendation is acceptable.
However, the recommen-dation has since been revised reducing the endurance test from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
The attached revised Additional Short Term Recommendation No. 2 shoul~ be used instead of the original. 'rt is requested that you fo'llow the. provisions of the revised AFW pump endurance test provisions and submit the requested test information.*
- 3.
Your response to this recommendation is generally acceptable.
However, we need detailed information to demon.strate conformance with NUREG-0578 (2.1. 7.b) criteria and clarifications in the Octpber 30,*1979 NRC (H. Denton) letter to
- all operating plants; namely, single failure, testability, power supply and indication accuracy.
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t' e
.. 2,..
C.
Long Term Recommendations
- 1.
Recommendation (GL-3)
- ..vcfor -r.esponse to this recommendation. is not cl ear.
From the response to GS-5 above it *appears that operator acti-on* outs-ide the control room is required-_followi.ng*a-loss of.all AC power.. It also appears that the turbine
'"*-~*-*~*-ar*Tven*- pump may have to be operated in an on... off mode for* AFW contra l.
Iri the long term we require that, following a complete loss of AC power, no operator actior:i should be necessary. outside the coritrol room for at least
- two hours.
You should also verify that on:..off control.of the turbine can be accomplished from the control room without AC power.
It is requested that you commit to meeting these requirements in addition to the instrumentation modifications discussed in your response in the long term.
- 2.
Recommendation (GL-5)
See GS-7 for staff position.
- 3.
Recommendation (Plant Spedfic)
You have committed to -performing the design re-evaluation requested in this recommendation.
Your commitment i-s acceptable.
We request that you submit the results of the re-evaluation for our review.
D.
Basis for AFW System Flow Requirements We request that you provide a commitment date for responding to the infor-mation requested in Enclosure 2 of th.e NRG letter dated September 25, 1979.
Attachment Revision to Reconnnendation No. 2 of "Additional Short Term Reconnnendations": Re*garding Auxiliary Feedwater Pump Endurance Test The licensee should perform an endurance test on all AFW system pumps.
The test should continue for at least 48*hours after* achieving the followi_ng test conditions:
- Pump/driver operatfog at rated speed and
- Pump developing rated discharge pressure and flow or some higher pressure at a reduced 'flow but not exceeding the pump vendor's* maximum permitted discharge pressure value for a 48-hour test
- For turbine drivers, steam temperature should be as close to normal oper-ating steam temperature as practicable but in no case should the temp-erature be less than 400°F.
Following the* 48..:ho~r pump run, the pumps should be shut down and. a 11 owed. to cool down until pump temperatures reduce to within 20°F of their values at the start of the 48-hour test and at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> have elapsed.
Following the cool down, the pumps should be restarted and run for one hour.
Test acceptance criteria should include demonstrating that the pumps remain within design limits with respect to bea.ri nq/beari ng oil ter1peratures and vi brat ion and that ambient pump room condi-tions (temperature,' humidity) do not exceed environmental qualification limits for safety~related equipment in the room.
The licensee should provide a sunnnary of the conditions and.the results of the.tests.
The sunnnary should include the following: *1) A brief description of the test method (including flow schematic diagram) and how.the test was instrumented (.i.e., where and how bearing temperatures were measured).
- 2) A discussion.of how the test con-ditions (pump flow, head, speed and steam temperature) compare to design operating conditions.
- 3) Plots of bearing/bearing oil temperature vs. time for.each bearing of each AFW pump/driver demonstrating that temperature design limits were not exceeded.
- 4) A plot of pump room ambient temperature and humitidy vs. time demon-strating that the pump room ambient conditions do not exceed environmental quali-fication limits Jar safety-related equipment in the room.
- 5) A statment confirming that the pump vfbration did not exceed allowable Vimits during tests.