IR 07100023/2011006
| ML18052B378 | |
| Person / Time | |
|---|---|
| Site: | Palisades, 07100023  |
| Issue date: | 11/18/1987 |
| From: | Burgess B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Norelius C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8711230327 | |
| Download: ML18052B378 (5) | |
Text
-.
- NOV 1 B 19Bt MEMORANDUM FOR:
THRU:
Charles_E Norelius, Director., Division of Reactor Safty W. G. Guldemond, Chief, Reactor Proj&ts.Branch 2 FROM:
B. L. Burgess, Chief., :R9ctor,P,rojects,Section.2A SUBJECT:
PALISADES STATUS REPORT FOR ltiE PERlOD OCTOBER 23 THROUGH NOVEMBER 6, 1987 Enclosed is the Palisades bi-weekly status report for the period.cover,ing October 23 through November 6, 198 Two Resident Inspectors monitored licensee activities at the plant during this report perio Status reports of this type are.intended to provide NRC. management aru:I the-pub l i c with an overview of plant activities and NRC inspection activitie Subsequent monthly inspection reports will address many of these 1:Dt>ics in more detai Enclosure:_ Status Report cc w/enclosure:
Mr. Kenneth W. Berry, Director Nuclear Licensing David P. Hoffman, General Manager DCD/DCB (RIDS)
Licensing Fee Management Branch Resident Inspector, RIII
':c Ronald Callen, Michigan Public Service Commission Michigan Department of Public Health T. V. Wambach, LPM, NRR 8711230327-8~55 PDR ADOCK 0 PDR R
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- RI II~
Mess/cs 11/0/'6?
B *. L Burgess., Chif Reactor Projects Section _2A Rl~I
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ENCLOSURE PAllSADES STATUS REPORT FOR THE PERIOD OCTOBER 23 - NOVEMBER 6, 1987 1;
Plant Status
- As of 8:00 a.m. on November 6, 1987, Palisades was in cold shutdown with
- -temperature-was 100 degrees F and shutdown *cooling was in* operatio ** facility Operations Summary i-he facility has been shutdown since October 1, 1987 when the plant was taken off line for the planned maintenance outag The plant is
,-currently on schedule for a November 13 on-line date. Specific*
- situations of interest are identified below.
. ltems of Special Interest fitness for Duty
.. Jn the licensee's continuing program of verifying fitness for duty, unannounced drug testing was conducted on October 20 and November 2, 1987, for 291 people, the majority being contractor personnel. Following communication of the results of the drug tests to the licensee, action
..... o,,.,;:.Was~*ttaken--to tenninate site access for six. contractor personne One
- cc-addi*tiorial contractor person had been terminated before the results were know The licensee reviewed the work activities of these seven employees to tiftennine if any corrective action was necessary. Certain safety related
.. work *activities were identified and will be verified correct by
- inspection and/or retest prior to plant restar Diesel Generator Load Test
- '.' Recent-advances in Diesel Generator (DG) loading modeling studies
- ..,.,iTidicated that the 1-1 DG may not be capable of maintaining the -required
~voltage for loads sequenced onto the DG during a design basis accident
- iDBA).
The voltage regulator utilizes both voltage and current feedback in regulating output voltag Unloaded voltage regulator response
- * 1:esting was conducted on September 4, 1987, and focused on the voltage
.*f-eedback portion of the voltage regulato To prove DG operability
- and the acceptability of the current feedback portion of the voltage regulator, full load testing was conducted on October 31 and November 1,
.1987. *While at a reduced bus voltage (2300 vs. 2400 volts) and loaded to
<:"the approximate OBA load, the P-8A auxiliary feedwater pump (last load *
- .sequenced on during the OBA) was then started. Voltage dropped about 400 volts for a brief (1.96 seconds) perio No loads were lost *and the test
- is*.cons i dered acceptable proof of the operability of the DG under the OBA loadin The licensee will change its loading model to reflect the DG response characteristics documented during the tes *
During setup for perfonnance of the special DG load test on October 31, 1987, several problems were encountered. After loading the 1-1 DG with startup transfonner loads, the startup transfonner breaker tripped at 11:35 An unexpected voltage drop occurred on the vital bus carried by the D Concurrently with the voltage drop, an undervoltage condition was briefly experienced which caused the automatic start of the 1-2 DG~
A four hour non-emergency report of this actuation was reported to the NRC at 1:43 Subsequent to this event and while measuring load parameters, a ground alarm was received on vital bus IC and control room operators observed DG output voltage decreas Immediate actions by the operators involved an attempt to restore voltage and remove loads from the affected bus. Based on an apparent lack of the DG response to operator actions, DG 1-1 was tripped at 1:06 The bus was then reenergized from station powe It was 1 ater detenni ned that the ground path was created by the tes*t instrumentation hooku One of the three phases suppling DG metering had blown it's fuse, causing the speed controll£r to lose voltage and disrupting control room DG meterin The test equipment was retonnected properly and the fuse replace *
Another effect of the bus voltage fluctuation was a blown fuse in the control circuit for the shutdown cooling flow control valves. Since the valves remained in their throttled positions, it was not until 2:45 that the inoperative valve controls were discovered. It was then determined that the valves were controllable from the remote shutdown pane At 3:30 p.m. the fuse was replaced and valve control verifie No continuing operability concerns exist in relation to the blown fuses since they both were associated with known causes, ie, a ~round fault and an unusual voltage perturbatto The cause of the voltage perturbation was determined to be a lack of familiarity regarding the mode of operation of the DG voltage regulator while shifting vital bus loads from the Startup Transfonner to the D The licensee is considering two options to address this problem; a procedural change requiring operator action or a plant modification which would automatically ~
shift DG voltage regulator during live bus load transfers between the DG and the Startup Transforme. - -- -.
Licensee initiative in developing and perfonning the load modeling studies is commendable, as it is not a common industry practice. Actions taken in resolution of the indicated perfonnance problems were conservative and forthrigh Outage Activities The scheduled 45 day maintenance outage is progressing ahead of schedule and currently a November 13, 1987. on line date is schedule Emergent work is bEing scheduled and has not impacted the critical path wor Inspection of th~ outage activities included review of local leak rate
- testing of containment isolation valve Of the 65,200 seem leakage
....
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allowed by the Technical Specifications, the total as-found leakage was 31,889 see Limitorque valve operator testing, valve rebuilding and retesting was observed. The scope of work, licensee involvement~ and contractor support of this project extend considerably beyond the scope of the IEB 85-03 requirements and, although some control problems were identified, represent an excellent effort to improve the condition of valves at Palisades. The inspector continued review of the low temperature over-pressure protection syste The licensee is addressing the concerns expressed in report 255/87024 by re-analysis, setpoint changes and changes to the license requirements. Testing of the steam generator snubbers was observe One of the three selected for testing failed due to weld porosity evidenced by identified fluid leakage. This snubber was repaired and retested satisfactoril Fire Main Break At 10:55 a.m. on November 6, 1987 an underground portion of the 10 inch fire main ruptured causing th~ automatic starting of all three fire.
pumps.. At 11:00 a.m. the pumps were turned off. After isolating the break the system was refilled and restored between 11:15 and 11:40 ~. Later that day at 5:20 p.m., it was discovered that the print had been misleading and that three sprinkler systems and twelve hose stations were inoperable as a result of isolating the brea The required fire tours and continuous fire watches were commenced, and routing of fire hoses for backup fire suppression was completed at 11:20 '
The suspected cause for the line break was the outage work which placed heavy loads on the road over the fire heade Additional evaluation of the root cause of the break is underwa Final repairs should be completed on November 10, 198 The delay in compensatory measures was a result of two factors; a confusing print which showed two lines crossing which were not connected together and the licensee not verifying system operability after isolating three header valve.
Changes to Period of Status Reporting This is the sixth of the bi-weekly status reports for Palisades, made in response to the directions of the T. E. Murley memorandum dated August 3,~--
198. NRC Staff Activities During the Period Two NRC resident inspectors monitored plant operating activities* between October 23 and November 6, 1987, including corrective actions for equipment problems and followup on other issue The details of these activities can be found in Inspection Reports 255/87025 and *
255/87029(DRP).
A five man R~gion III maintenance team inspection was conducted on October 26 through 30, 198 The results of the inspection are documented in Inspection Report 255/87027(DRS).
The inspection staff at Palisades during the report period consisted of the following:
..
Eric R. Swanson N. R. Wi 11 i ams W. J. Timmer
Senior Resident Inspector, Palisades Resident Inspector, Big Rock Point Resident Clerical Aide 4