ML20211G148
| ML20211G148 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/13/1987 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-7-028, 2NRC-7-28, 87-02, 87-2, NUDOCS 8702250291 | |
| Download: ML20211G148 (20) | |
Text
17.Ce*CZ 4
'At3 2NRC-7-028 Beaver Valley No. 2 Unit Project Organization Telecopy 4 2 641 Ext.160 S.E.G. Building P.O. Box 328 February 13, 1987 Shippingport, PA 15077 United States Nuclear Regulatory Conmission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Administrator f
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 HVAC Control Circuits Problems on Loss of Offsite Power Potential Significant Deficiency Report 87-02 Gentlemen:
This Potentially Reportable Significant Deficiency Report is being submitted pursuant to the requirenents of 10CFR50.55(e).
It is anticipated that no adoitional reports will De required.
DUQUESNE LIGHT COMPANY By A
J. J. Carey Sr. Vice President LMR/ij r NRC/LMR/SDR/8702 At hment AR cc:
Mr. P. Tam, Project Manager (w/a)
Mr. J. M. Taylor, Director (3) (w/a)
Mr. J. Beall, Sr. Resident Inspector (w/a)
Mr. L. Prividy, NRC Resident Inspector (w/a)
INPO Records Center (w/a)
NRC Document Control Desk (w/a) 8702250291 870213
{DR ADOCK 05000412 k
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ATTACHMENT 1.
Summary A review of control circuit logics for various BVPS-2 safety-related HV AC supply and exhaust fans has revealed several problens.
Specific-ally, following a loss of offsite power event (LOOP) and the subse-quent transfer to energency power, certain HVAC systems may be restar-ted and sequenced in a manner that is not in accordance with design requirements for those systens.
2.
Immediate Action Taken Analysis and specific corrective action was cannenced resulting in Advanced Change Notice (ACN) C-174.
Mr. L. M. Rabenau, Canpliance Engineer, Beaver Valley Unit 2, notified Mr. Lowell Tripp of NRC Region I of this concern on January 16, 1987.
3.
Description of Deficiency Five specific problems were identified:
a.
Certain safety-related HVAC systens are designed to operate with only one train of the systen running at one time.
However, in some cases, after a LOOP, both trains of an HVAC systen may start up autanatically.
This problen is applicable to systens located in these areas:
Emergency Switchgear Area (HVZ), Control Roan Area (HVC), and Main Steam Valve House Vault Area (HVR).
b.
The control logics for certain HVAC systens function such that if one train on the systen is operating, and a LOOP occurs, the other train will be automatically restarted once energency power is restored.
However, should the train being restarted incur a fail-ure, the other train will not autanatically start up.
This prob-lem is applicable to systens in the following areas:
Cable Vault and Rod Control Area (HVR), and Control Building Area (HVC).
c.
For the Control Room Area HVAC system (HVC), the energency supply f ans are autanatically operated after a sixty minute time delay which is initiated by a CIB/ radiation signal.
If a LOOP occurs after the timer has been energized, the timer resets and begins timing sixty minutes again once energency power is restored.
d.
The Emergency Switchgear Ventilation Systen (HVZ) is designed to maintain a constant fan discharge tenperature by the modulation of danpers for outdoor air, return air, and exhaust air.
In order to maintain temperature, the outdoor air and exhaust air danpers need to move in one direction (open/close) while the return air danper must move in an opposite direction (close/open).
Since systen requirenents cannot tolerate a fail-open return danper which would result in overheating of the energency switchgear area, all dan-pers were purchased fail-closed.
This results in allowing the operation of the subject three danpers in the sane direction.
e.
The Control Room Air Conditioning System (HVC) contains two refri-geration units which have a reset function that requires a manual reset at the equipment location after a LOOP event.
- However, systen design requirenents necessitate an immediate restart following a LOOP and restoration of energency power.
4.
Analysis of Safety Implication a.
The present control circuits will autanatically start both orange and purple trains following a LOOP.
The affected areas are not designed to accommodate the increased air flow resulting from parallel operation of both trains.
b.
The HVAC train operating at the time the LOOP occurs is locked-out by the systen logic fran restarting once energency power is restored.
Thus, failure of the opposite train (which is a cred-ible single failure) could result in neither of the HVAC trains operating even though energency power is restored, leading to a loss of ventilation in the affected areas.
c.
The starting of the supply fans could be delayed beyond the sixty minute design requirement, and may occur after the depletion of the bottled compressed air systen.
This could result in no HVAC flow to the control room area.
a.
The current operation of the subject danpers renders then unable to maintain discharge air tenperature which may cause overheating in the energency switchgear area, e.
Because the refrigeration units do not reset automatically follow-ing a LOOP, a lack of coolant to this systen results.
5.
Corrective Action to Resolve the Deficiency ACN C-174 h as been superseded by ACN-D-0015, which describes the detailed corrective action (attached).
It generally calls for rewir-ing of sane control circuits and/or addition / deletion of timers in order for the systens to perform in accordance with design require-ments.
6.
Additional Report No additional reports are expected.
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l ACM C-174 I
Page 2 of i
System / Equipment Description of Channe Besson for Chamme i
1.
Control Room A/C Sy"L9"
( oNE PE4 EAA4(JrT,)
v'2HVCAACU201A,B (a) Add two Agastat timers to control (a) Current circuit design will start 4
circuits to allow the running ACU both ACUS following a loss of to restart following a loss of offsite power. Per system offsite power.
requirements, it is unacceptable h/hh9-l[3 to have both units'im operation.
(b) Relocate 2HVC*PDS201A,B such that (b) 2MVC*PDS201A,B are currently PI)S201A(p) senses ACU201B flow and located in common discharge of PDS20lB(P) senses ACU201A flow.
2NVC*ACU201A&B. Nust sense the l
Rewire PDS201A,B interlock to flow of each ACU individually to ACH2OIA,8 to prevent both units ensure that only one unit runs.
from running.
Per system requirements, it is
(,
unacceptable to have both units j
in operation.
2ilVCAREF24A (4y A-s D)
(a) Add two Agastat timers to reset (a) Following a loss of offsite power,
[3 h
8 (dyYA -tC) c ntrol circuits following a 2NvC*REF24A,B control circuits (7
must be reset before units will l
restart. Currently this can l
only be accomplished via manual pushbuttons on the unit.
(b) Hevise alarm circuits to alarm (b) Alarm currently activates on loss on unit trip due to trouble of power only.
or loss of power per KSK 21-1 and system requirements.
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ACN C-174 Page 3 of i
System / Equipment Description of Chanae Beason for Chanae*
s!
2.
Control Room Emergency i
Pressurization System M
2ilVC*FN241A,B !
(a) Add new circuits for CIB timers, (a) Timers must remain operable during having power feed from uninter-a loss of offsite power to ensurc uptable source.
that 2NVC*FN241A,B will start 60 min after a CIB.
Present circuit desiga
.f will drop out CIS timers on a lose of power and will reset to time zero
,4 when power is resumed.
1 3.
Control Buildina A/C System 2ilVC*FN266A,B [
(a) Add two Agastat timers to control (a) Current circuit design will start.
circuits to allow running fan to the backup faa following a loss of restart following a loss of off-power and the duty fan will not
_j M -/A site power.
restart on a single failure (los.s I
of diesel), resulting in a loss of ventilation.
D I
Q l 4.
Cable Vault and Rod Control Area A/C System Q) w 2HVH*ACU208A,8 !
(a) Add two Agastat timers to (a) Current circuit design will start control circuits to allow the backup ACU following a loss of I
running ACU to restart offsite power and the duty ACU will following loss of offsite not restart on a slagle failure VYO-2A power.
(loss of diesel), resulting in loss of ventilation.
(b) Hewire 2tiVR*PDS30A,B inter-(b) A single failure may result in lock to ACU208A,B to prevent both ACUS running. Per system both units from running.
requirements, it is unacgeptable i
to have both units in operation.
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2217-12241-114 y
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I ACM C-174 j
Page 4 of 1
System / Equipment Description of Change Reason for Channe*
I 5.
Emergency Switchgey Ventilation System I
2HVZ*FN261A,B /
(a) Add two Agastat timers to (a) Current circuit design will start i
control circuits to allow both fans following a loss of running fan to restart offsite power. Per system following a loss of power.
requirements, it is unacceptable
+
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(b) Rewire interlock from (b) A single failure may result in 2HVZAPYL21A,B to FN261A,B both fans running. Per to prevent both fans from system requirements, it is I
running.
unacceptable to have both fans in operation.
l 2HVZ*FN262A,B (a) Rewire control circuits to (a) Current circuit design will start slave FN262A,B operation off both fans following a loss of I
of FN261A.B in all modes of offsite power directly from diesel l
operation.
sequencer. Per system requirements.
l 4W-3/7 exhaust fans are to operate in conjunction with its corresponding supply fan.
g (b) Purchase two Class IE pressure (b) A single failure may result in both differential switches. Install fans running. Per system requirements o-orange switch to sense FN2628 it is unacceptable to have both fans flow and purple switch to sense in operation.
O FN262A flow. Wire switch in k
fan trip circuit to prevent both fans from running.
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8 ACx No.
(E-174 DESIGN CHANGE
SUMMARY
CAM DATE sth 3 / f s-nao TITLE: HVAC, COMTUL CIRCutT CHAAMtis SAFETY CLASS:
SEISMIC Ct. ASS:
REFERDCE DOCUMENTS:
IE: 3 NON IE: C SEE~'ATTActlab AC.M BLOG. AREA: t/A410:45 APPt.!CA8!LITT:
LICEN$ING/NRC IMPACT:
Testing C
C R
PRESENT INSTL. STATUS:
Operability N
Tech Spec C TALLO Maintaineility C C
ER Personnel Safety C Reg. Guide No:
OM CHAPTER: VAdlats Other:
Other Lic Doc:
ENVIRONMENT:
No Effect 3
}ARSH C Mit0 C OESCRIPTION AND REASON FOR CHANGE:
SEE. ATT Ac+1 eh Ac.N PROPOSED SOLUTION:
c>
seE ATTACHEh NCd ORIGINATOR / PHONE NO.:
REY! EWER:
NEED Pre Pre-Pre-M/A DCC fr DATE:
T/0 Test FL EYALUATION:
APPROVALS - OCCG:
In Scope Out of Scope C A f WA AM'
$1gnif. g Cha i rman;.,,
En ineering Date Norm. Act.
g, i,gg Accept: As Writ.
As Mod t fied C * * /fLL j) _.,j' f,.
3' Study:
In Scope C Out of Scope C
SWEC Engineering g, Date Reject: Compi.
C Rec. Post-01 C
SWEC Construction Date IMPACT:
(If yes, see attached)
Eng r. :
Yes y No g Eng r.. :
Yes C No y COST:
SCHED: Const.:
Yes No w Const.:
Yes No Testing:
Yes C No V IMPLEMOTATION:
DIRECTED APPROVA1. - OCMG:
Pre-Fuel Pre-T/0 C Load Post FL L
Pre-Test C But Pre-01 C
Chairman, OCMG" Date
~
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