ML20126E669
| ML20126E669 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 12/23/1992 |
| From: | Beckman W CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9212290260 | |
| Download: ML20126E669 (10) | |
Text
h y
.]
- y -
Consumers -
William L Beckman :
lYant Manager AIKHNEAN5 PROGRESS big Rock Point Nuclear Plant,10269 US-31 North, Charlovoix, MI 49720
'i December 23, 1992 Nuclaar Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-155 - LICENSE DPR-6'- BIG ROCK POINT PLANT FOLLOW-UP RESPONSE _TO INSPECTION REPORT 92-019 As discussed in our letter dated November 24, 1992, Consumers Power Company.
was to provide a response to each of the Open and Unresolved Items described in the subject Inspection Report.
The attachment to this-letter-provides this-information.
With. spect to Open Item (155/92019-02) concerning our_ ungrounded 2.4 Ky electrical system, we understand that this issue-is.under review by the NRC and that no action is required by Consumers Power Company at this time.-
Should any questions arise concerning these issues, please contact us 'at your convenience.
,Jdefy 8MMM p'
' William L teckman 4
' William L Beckman Plant Manager CC: -Administrator, Region _III, USNRC
~ >
NRC Resident Inspector -: Big Rock Point-w.
ATTACHMENT
~
290080.
p'l' y
,-92 _12290260 92 _1223,,,
5c
. P D*t.
- A asexe7tGYCOMPANY:
a
ATTACHMENT Consumers Power Company Big Rock Point Plant Docket 50-155 FOLLOW-UP RESPONSE TO INSPECTION REPORT 92-019 December 23, 1992 lies i
l FOLLOW-UP RESPONSE TO INSPECTION REPORT 92-019 Qpen Item 155/129J9-01 Lack of a calculation to demonstrate that the 46 kV line could maintain adequate voltage levels during a design basis accident (DBA) with the 2.4 kV voltage regulator out of service.
)
I
Response
As discussed in the Inspection Report, a preliminary calculation was performed _
'l during the Inspection which concluded this mode of operation acceptable.
A formal load flow calculation will be performed and reviewed by offsite engineering personnel to document the acceptability of this configuration.
This effort should be completed by May 1, 1993.
Within 60 days following completion of the analysis, operating procedures will be updated to advise operators that this mode of operation is acceptable.
Open item 151/92019-04 Addition of acceptance criteria to the Daily fuel Oil Report.
Response
The Daily Fuel Oil Report has been revised to address this concern.
The report now provides a level for each tank at which refuel is required. A copy of the revised report is attached to this letter and we consider all actions complete.
Unresolved _Jtem 155/92019-06A Calculations performed during the inspection concluded that the required NPSH for the diesel generator cooling water pump could be met at high flow rates providing significant lake level decrease or temperature increase do not occur.
The Inspectors were concerned that the limits for lake level and temperature were not available to plant operators.
Response
As discussed in the report, Consumers Power agreed to issue an Operations Memo to advise plant <.1rators on the potential loss of EDG cooling-water-oump NPSH due to lake level. This memo was issued on September 25, 1992 and a' copy is attached for your information. As stated in the Operations Memo, this guidance will remain in effect until the issue is resolved or the information is incorporated into the operating procedures.
The reason that temperature monitoring wa: not included in the guidance is_ because enhancements are in progress to improve flow characteristics and monitoring of this piping. These enhancements will be completed prior to lake water temperature increasing due to summer temperature effects.
Flow characteristic improvements will mitigate the effects of warmer water on the cooling capability of this system.
d
'2 Unresolved Item 155/92019-068 The team was= concerned that the suction pressure acceptance criteria
-identified in the weekly' surveillance procedure was too high to assure proper operation of the cooling water system.
Response
As discussed in the report, Consumers Power Company agreed to re-analyze the?
suction pressure acceptance criteria for the surveillance procedure.
This action is complete and a_ copy of the revised acceptance criteria is attached to this letter.
')
Unresolved Item 155/92012-06C The team was concerned that suction screen cleaning was being postponed after suction pressures indicated potential plugging.
Trending d;ta showed that maintenance orders were written when suction pressure fell outside the expected range, but on occasion the work completion was not timely, i
Response
l The surveillance procedure has been revised (copy attached) to require high priority to maintenance orders for suction screen replacement.
In addition, values are being assigned to minimum discharge pressure and maximum suction pressure to identify screen clogging and maintenance order generation. These values are being put in the surveillance procedure.
ODen Item 155/92-019-07 During the inspection, wiring-discrepancies between the electrical design-drawings and the as-build configuration of the EUG control-panels.
Response
As stated in the inspection report, the observed discrepancies did not affect the operability of the-circuits. Drawing changes have been' initiated.
Walkdowns are part of the modification process and should identify any other deficiencies which will be handled on a case-by-case basis.
Current surveillance testing insures equipment operability.
ODen Item 155/92019-08 The team was concerned that control of conduit and cable. tray fill requirements was deficient and that licensee _walkdowns _ identified seme overfilled conduits that did not have a thermal analysis.
Response
-The electrical design specification (E-8)_will be revised to incorporate 1
conduit and cable tray sizing / fill instructions. The raceway schedule has been reviewed to identify which conduits / cable' trays exceed these guidelines and evaluations are in progress. All safety-related overfills-have l een -
resolved and the-remainder will be reviewed on a case-by-case basis.
The.-
target ' completion date for the' effort is December 1993, which allows time -for walkdowns in the 1993' Refueling Outage.
I.
l 4
. 4'
-3' poen item 1EE/92019 The team was concerned with the availability of design information to insure that installed fuses were properly selected and sized. Although an operability concern did not exist because the circuits'have functioned when required, program improvements were warr.nted.
Response
Although design information is not readily available for all fuses at BRP,_ it-..
has been our philosophy to do only "like for like" replacements to insure configuration control. As discussed in the Inspection Report, BRP personnel identified this concern just prior to the EDSFI from our review of inspection.
results at other facilities and is i the process of establishing a
>rogram.
The program has a target completior late of December 1993, since wal(downs are required during the 1993 Refueling Outage.
- ' D ATE FUEL OIL AEPORT DATE
. TIME TO BE RUN ON *B* SHIFT DAILY TIME HEATING BOILER FUEL OIL LEVEL AND WATER USAGES
. -. ~wwx -
GAUGE ORDER OIL WHEN WE CAN RECEIVE 7,500 CALIANS.
SPECIFIC GRAVITY:
PREVIOUS LEVEL Heating oil must be.825 to.887.
Premium diesel oil must be.802 to.876.
PRESENT LEVEL Demin Water
- Fuel Oil
- Feed Water.
(FS-9502)
(FI-9062)
(FI-9563)
PREVIOUS GAL.
Present Present Present PRESENT GAL.
Previous Previous Previous DAILY USE Daily Wkly Use Wkly Use Use
% EFF = Zet.dwater Gallons E 6.44 EFF % =
Fuel Oil Gallons EMERGENCY DIESEL FIRE P"MP OIL (T-53,)
GAUGE DIPSTICK COMMENTS USE PREMIUM OIL ONLY.
FULL TANK IS PREVIOUS LEVEL 44".
EMERGENCY DIESEL FIRE PUMP WILL BE DIPSTICKED THE FIRST FRIDAY OF EVERY MONTH.
REFUEL AT OR ABOVE
^
PRESh.NT LEVEL 26' CONTACT STOCKROOM WHEN PICEIVINQ_QIL SHIPMENTS.
EMERGENCY DIESEL CENERATOR OIL (T-83)
GAUGE DIPSTICK COMMENTS USE PRIMIUM OIL ONLY.
FULL TANK PREVIOUS LEVEL
- t 72* (6.0 FT).
EMERGENCY GarJRATOR TANK WILL BE DIPSTICKED THE FIRST FRIDAY OF EVERY MONTH.
PRESENT LEVEL REFUEL AT OR ABOVE 50" (4.2 FT).*
nATE CONTACT STOCKROOM WHEN RECEIVING OIL EHTPMENTS.
STANDBY DIESEL GENERATOR OIL GAUGE COMMENT PREVIOUS LEVEL ORDER OIL AT OR ABOVE 34* (approx. 450 Oa1. ) USE PREMIUM OIL ONLY. FULL TANK IS 40".
CONTACT STOCKROOM WHEN RECEIVING OIL SHIPMENTS.
I WAREHOUSE SECURITY SECURITY BOILER ASD IN OUT PREVIOUS %
PRESENT %
- HOTEt An alarm at tne high fuel oil annunciator indicates that the tank being filled (T-53 or T-83) is full and refueling should be terminated.
- NOTE: Record once per week on Monday.
REVIEWED BY SHIFT SUPERVISOR:
e.
c, OPERATIONS MEMO #07-92 (REV. 1)
TO:
Shift Supervisors Operators CONSUMERS POWER
\\
FROM:
WJTrubilowicz COMPANY DATE:
September 25, 1992 Internal Correspondence
SUBJECT:
BIG ROCK POINT PLANT-EMERGENCY DIESEL GENERATOR OPERABILITY CC:
' Shift Supervisor Log Quality Review Form Control Room Log QA-05A [2]
Training Department Log DCC 740/22*07*02/L One of the concerns that has been raised as a result or the EDSFI deals with the ability of the Emergency Diesel Generator (EDG) to draw cooling water out of the Discharge Bay under low lake level conditions.
The length of the suction line was measured on September 22, 1992 and it was calculc,ted that it becomes uncovered at a lake level of ~577.1 feet above sea level.
Until the issue can be resolved, we nee'l to monitor the actual lake level and set an operability requirement for the EDG based on lake level.
This will be accomplished as follows:
on the
'C' Shift each day, take a reading on the lake level instrument located in the Discharge Canal and record it on the Control Room Log Sheet.
If the lake level drops below the 5't8 foot elevation, the EDG shall be declared inoperable and the three day LCO as specified in Technical Specification ll.3.5.3.A.2 shall apply.
This Operations Memo will remain in effect until the issue is resolved or this information is incorporated into the operating procedures.
consumm N"
BIG ROCK POINT NUCLEAR PLANT EA J#- 76 -0'N'
~
anQ""
ENGINEERING ANALYSIS WORK SHEET Sheet.-.L of -. 2,-
h M*h Title 0
INITIATION AND REVIEW Initiated Rev Method Check (J Technicany Rev'd By Date Description By Date Cc R
t O
Original issue WJf]m}i 'L 4 ?
V
/A W f ff.
yv
.y To YYA A
Yke kf cadR p& n a#s4l A A
cwC, wL AL L L 4L E bG asp,
2AJ O'?40 G2.0036 filo - 9 2 - EM - C120 i
a 9-2z-9t Wu. AgA A
~
BRP 090 02/0tIB8
4,e 4
...a
-.2
.m u
-_m,
.r
,e
^
power -
BIG ROCK POINT NUCLEAR PLANT EA dv if *H5-vo'"
- c consumers ENGINEERING ANAL.YSIS CONTINUATION SHEET sheet z-of 2--
rowcMius ReV N D
MICHIGAN 5 PROGRi$$
M 5 1Lo1ML
/A Q.
- M11,
.+ L
' ' # es 6:~ ~ a %
a wa a.-
du. 4 QA AGm o L A csa p 4 6 andL 4 A es&D pad. ch.f,4J4A, L.a agr-a o,a. 4 1 ( p g prW 4 AM 4.%.
sJ no" 4,,, _,,,
168.h~
t - ?
~7~0 S77. I t
I bl5E,25i 1 " O==..M2,7s "
11.9ft
_L i
',.JM2. ]L + s 2. v ii 2 0f'_ -- ll.3 [t
.. S 77. / [4 b
i
- _ u,_
- _,. _
1 I
t
-; -m - - -. -,
,I l
t
..t
{
I t
BRP091 02/01/88
.17-25 Revision 17 l
EMERGENCY DIESEL GENERATOR Page 9 of 18 AUTO TEST START Init
,'Jate Dipstick Oil Level (between ADD and FULL).
Water Pump Suction "Hg Vac.(PI-834)
- (12 to 13.5)
Water Pump Head psig (PI-835) *(7 to 12)
Water Pump Discharge psig (PI-836) *(8 to 13)
(0P) 1.
Acceptance Criteria:
Water Pump Discharge (PI-836) 2 6.25 psig and Water Pump Suction (PI-834) s 14" Hg Vac Acceptance Criteria Met? Yes No
- CAUTION:
If cooling water discharge pressure is less than 8 psig or suction pressure is greater than or equal to 13.5 inches Hg,
- it may be an indication that the
- suction strainer is beginning to plug. Maintenance action to clean the strainer must be given a BLGH priority to assure the EDG will operate properly.
- A*************
(0P) j.
If PI-836 < 8 psig or if PI-834 2 13.5" Hg Vac, notify the Shift Supervisor to initiate a Maintenance Order to clean the suction screen.
N/A
-(0P)
T7-28\\nla
. _ _ _ _ _ _ _ _ - - - - _ _ _ _ _ _ _ - _ _ - _ _ _ _