IR 05000387/1989029
| ML17156B566 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/18/1989 |
| From: | Anderson C, Thomas Koshy NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML17156B565 | List: |
| References | |
| 50-387-89-29, 50-388-89-32, NUDOCS 9001080272 | |
| Download: ML17156B566 (5) | |
Text
U.S.
NUCLEAR REGULATORY COMMISSION
REGION I
Report Nos, 50-387/89-29 50-388/89-32 Docket Nos.
50-387 50"388 License Nos.
NPF-14 NPF-22 Licensee:
Penns lvania Power 5 Li ht Com an 2 North Ninth Street Allentown Penn s 1 vani a 18101 Facility Name:
Sus uehanna Steam Electric Station Units 1 and
h Inspection At:
Allentown Penns 1 vania Inspection Conducted:
November 6-8 1989 Inspectors:
Thomas Kos y,, Senior Re tor Engineer Plant Systems Section, ineering Bran D'v s n f ac Safety ate Approved by:
C. J.
And son, hief, Plant Systems Section, Engi eering Branch, DRS
/8 /F date Ins ection Summar
Ins ection on November 6-8 1989 Ins ection Re ort Nos.
50-387/89-29 and 50-388/89-32 Areas Ins ected:
Special announced inspection to review engineering initiatives and the licensee's practices to prioritize engineering activities.
Results:
The licensee's practices to prioritize engineering activities were found to be acceptable.
However, review of the 120IEt AC voltage drop study identified an incorrect assumption.
This, item is discussed in Section 3.0 of this report.
r'001080272 89l222 PDR AOOCK 05000387
Details 1.0 Persons Contacted Penns lvania Power
& Li ht Com an PP&L J.
A. Bartos, Senior Project Engineer, Instrumentation
& Controls G. J.
Bast, Senior Project Engineer, Electrical Engineering
. G. Butler, Manager, Nuclear Design D. J. Cardinale, Supervising Engineer, Instrumentation
& Control R,
M. Harris, Senior Licensing Specialist J
~ Kenny, Licensing Group Supervisor A. M. Male, Manager, Nuclear Plant Engineering J.
E. Rothe, Supervising Engineer, Electrical B. J.
Skoras, Project Engineer, Electrical A. F. Sleoa, Senior Project Engineer, Electrical Engineering 2.0
~Pur eee The purpose of this inspection was to review the licensee's engineering initiatives and pr-ctices to pri'oritize and execute engineering activities.
3.0 En ineerin Mana ement Recently, the licensee improved the resource management of significant technical tasks.
All tasks that cost $ 100,000 or more are classified as major projects and are subjected to a special team review.
This team consists of two Assistant Plant Superintendents, the Nuclear Project Manger, the Nuclear Design Manager, and the Supervisor for Planning and Licensing Services.
This review process provides a well-balanced perspec-tive at the initial stages of the program.
The function of this team is being formalized through a Nuclear Department Instruction 14.G. 1 which is currently in the draft form.
The inspector reviewed a preliminary report of significant tasks identified for 1990, projected tasks for the next 5-year-plan, and tasks that are currently deferred, No significant concerns were identified.
4.0 Review of Electrical and Instrumentation and Control En ineerin All engineering activities are executed through Engineering Work Requests.
A computerized data base is utilized to retain an all inclusive list of Engineering Work Requests (EWRs).
The inspector reviewed the EWRs in the Instrumentation
& Control and Electrical area.
The inspector selected
EWRs in each area which included activities scheduled for the next 6 months
. and the unscheduled EWRs.
The inspector discussed the details and the current status of the selected EWRs with the cognizant engineers.
During this review, the licensee staff stated that senior staff within the
department frequently meet to discuss prioritization of tasks.
Resources are reassigned based on a collective decision to support plant needs.
120V AC Volta e Pre Stud Task 9 and
One of the EWRs selected for review involved the voltage drop calculation of 120V AC circuits.
These calculations were first performed by a licensee consultant, Impell, in 1985 and were subsequently revised by United Engineers and Constructors in February 1988 through 1989.
Calculation No. E-AAA-005 dated February 25, 1988 identified the need for a minimum 122'9 volts at the distribution panel to operate the connected equipment at their desired voltage level.
This is 2. 19 volts higher than the nominal value of the distribution panel voltage.
An unapproved "Significant Operating Occurrence Report," dated October 10, 1988, documented two standby gas treatment system dampers to have insufficient voltage.
(Approximately 10 volts less than the minimum required voltage.)
The licensee stated that they were actively pursuing the acquisition of manu-facturer's data to confirm equipment function at reduced voltages.
Ouring the review of this concern, the inspector observed that the voltage calculations were based on the nominal value of the bus voltage.
The licensee's under voltage protections system at 4160V bus allows the grid voltage to be lower than the nominal value.
This undervoltage setpoint determines the sustained reduced voltage at which the.safety related bus isolates itself from the system and connects to the emergency diesel generator.
For voltage conditions above the undervoltage setpoint, the safety related equipment should be able to perform their functions.
The licensee's current calculations do not address the adequacy of the available voltage at the equipment under reduced voltage conditions and also during design bases events.
This is an unresolved item pending resolution of this voltage drop issue by the licensee.
(50-387/89-29-01 and 50-388/89-32-01)
4.0 Unresol ved Items Unresolved items are matters for which more information is required in order to ascertain whether they are acceptable, violations, or deviations.
Unresolved items are discussed in Section 3.0 of this report.
5.0 Exit Meetin The inspector met with the licensee representatives at the conclusion of the inspection on November 8, 1989, as denoted in Section 1.0.
The inspector summarized the scope and findings of the inspection at that time.
No written material was given to the licensee during this inspectio,