IR 05000348/1993001
| ML20034F002 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 02/12/1993 |
| From: | Cantrell F, Wright R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20034E992 | List: |
| References | |
| 50-348-93-01, 50-348-93-1, 50-364-93-01, 50-364-93-1, NUDOCS 9303020179 | |
| Download: ML20034F002 (8) | |
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UNITED STATES NUCLEAR REGULATORY COMM!sslON
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101 M ARIETTA STRE ET, N.W.
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Report Nos.: 50-348/93-01 and 50-364/93-01
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Licensee:
Southern Nuclear Operating Company, Inc.
P.O. Box 1295
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Birmingham, AL 35201-1295 i
e Docket Nos.: 50-348 and 50-364 License Nos.:
Facility Name:
Farley 1 and 2 Inspection Conducted:
February 2-5, 1993
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Inspector:
d 'kf. 72$M
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R.W. Wright,PropectEngineer Date Signed
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I Accompanying Personnel:
R. Pichumani, Geotechnical Engineer, Structural and Geosciences Branch, NRR R. Shewmaker, Senior Structural Engineer, Low Level Waste Management Branch, NMSS R. ' Lesniak, Regional Director, Federal Energy Regulatory t
Commission (FERC), Chicago
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G. Marshall, Civil Engineer, FERC, Atlanta C. Tjoumas, Deputy Director, Division of Dam Safety and Inspection, FERC, Washington, DC.
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Approved by:
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Floyd S. Cantrell, Chibf f '
Qate' Signed
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d Reactor Projects Section lB
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Division of Reactor Projects SUMMARY
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Scope:
This special, announced inspection was conducted in the areas of the cooling f
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water storage pond dam (ultimate heat sink), examining 'its crest, embankments,
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dikes, reservoir, emergency spillway, discharge and intake structures and associated instrumentation while accompanying the safety audit performed by
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NRC staff and its technical advisor, the Federal Energy Regulatory Commission.
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Licensee actions taken on a 10 CFR Part 21 item and a licensee event report were also reviewed.
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9303020179 930212 gDR ADOCK 05000348 PDR
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Results:
r No violations or deviations were identified.
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t In general, the ultimate heat sink dam / dikes and its associated structures and instrumentation were found to be operating. safely as designed and maintained-i in good condition. The downstream hazard potential was classified as " Low" in i
that in the unlikely event of the dam failing there would be no lives in t
jeopardy and very minimal economic loss.
Some routine maintenance
recommendations were suggested by the audit team to enhance existing field l
conditions observed and the licensee's current program for monitoring the i
dam's performance (paragraph 5.e).
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REPORT DETAILS
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1.
Persons Contacted
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Licensee Employees
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- S. Casey, Supervisor Systems Performance, Farley Nuclear Plant (FNP),
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Southern Nuclear Operating Company (SNC)
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- K. Lockhart, Service Water Engineer, FNP, SNC l
- D. McComb, Mechanical Supervisor, Southern Company Services (SCS)-
- A. Patko, Senior Engineer I, SNC
- B. Williams, Senior Geotechnical Engineer, SCS
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- L. Williams, Manager Training and Emergency Preparedness, FNP, SNC f
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- L. Young Jr., Chief Geotechnical Engineer, Bechtel-Consultant
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Other licensee employees contacted included engineers, technicians, security and administrative persornel.
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NRC Resident Inspectors j
- G. Maxwell, Senior Resident Inspector M. Morgan, Resident Inspector j
- Attended exit interview
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On February 2-3, 1993, D. Verrelli, Chief, Reactor Projects Branch 1,
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DRP, RII, was on site to follow the progress of Unit 2's shutdown for
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replacement of its leaking safety valve, observe resident inspector and
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CWSP dam audit activities.
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On February 2-3, 1993, S. Hoffman, NRR Project Manager (Farley), was on
site to followup on open items, evaluate current plant conditions, and observe dam audit activities.
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Acronyms and initialisms used throughout this report are listed in the
last paragraph.
2.
NRC Staff /FERC Audit of the Cooling Water Storage Pond (CWSP) Dam and-Associated Structures (45053)
The inspector accompanied two engineers from NRC, Headquarters, and three consultants from FERC, while they performed a safety audit of the j
subject dam and associated structures.
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Audit Criteria The audit / inspection evalauated conformance of the facility:to the Federal Guidelines for Dam Safety, June 1979; the Proposed.NRC Dam Safety Program, April 1991, and other incorporated documents such i
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l as NRC Regulatory Guide 1.127, Inspection of Water-Control l
Structures Associated With Nuclear Power Plants.
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Structural Review l
l Prior to performing the walkdown examination of the dam i
facilities, the NRC engineers and FERC consultants met with j
licensee engineers and their consultant and discussed the
following pertinent topics; I
o Farley's dam design criteria and assumptions made-demography, geologic, and seismic considerations; foundation j
and embankment compaction efforts utilized; expected
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seepage, settlement, stresses, and the results of stability analyses performed.
o Hydrologic data.
o Pertinent structural and design features of the pond's
spillway, intake and discharge structures.
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o Instrumentation of the dam.
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Any modifications, major maintenance or repairs that may i
have been implemented on the dam and associated structures since original construction.
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Previous Dam Inspections and Findings a
The audit team reviewed the data and results of the following on-i going licensee inspections conducted on the subject CWSP i
dam / structures; j
inspection Freauency Last Performed Procedure Spillway Level exceeds 07/08/81 FNP-0-STP-611 0 Channel El. 187
After Storms j
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Spillway Biennially 01/08/92 FNP-0-STP-611.1
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Channel and l
Struc' ure Seepage Test 5 Years 08/15/88 FNP-0-STP-125 j
Piezometer, Quarterly 01/13/93 FNP-0-ETP-4381
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Relief, and Observation Wells
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Horizontal Semiannually 10/05/92 FNP-0-ETP-4384 and Vertical Movement
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Inspection frecuency last Performed Procedure
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i CW Dam and Biennially 01/22/93
. FNP-0-ETP-4389
Dike Inspec.
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Visual Inspec.
Monthly 01/30/93 FNP-0-ETP-1035 l
of Rip Rap
and Embankment
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d.
Inspectinn of the CWSP Dam / Dikes, Reservior, and Associated
.l Structures
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The audit team examined the subject CWSP darg/ dikes, reservoir, and
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associated structures by performing a thorough visual.walkdown
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inspection of these facilities.
l The dam / dikes were examined for the condition of the crest, l
shoulders, groin areas, upstream and downstream embankment slopes, i
rip-rap, and for adequate grass cover.
These attributes were
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checked for any evidence of cracking, misalignment, scarps,
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slides, depressions, sinkholes, buldging, borrowing animals,
surface runoff erosion, uncontrolled seepage.. horizontal or
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vertical movements, and inapprepriate vegetation growth.
l The dam's central chimney' drain manhole and a sampling of relief well manholes (Nos. 9,10,11,4,9) were uncovered and examined to-
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see if these controlled seepage mechanisms were functional. The
.i total relief well and chimney drain seepage spilling from the twin parallel 12-inch steel pipes was noted at the downstream toe i
drainage ditch.
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The reservoir's perimeter, and the. upstream / downstream spillway
i channels were examined for any signs of slides, erosion, borrowing
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animals, debris, or inadequate grass cover.
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The river water intake structure and its pond discharge structure,
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the service water intake structure, the natural circulation discharge structure, and the storage pond spillway structure were
examined for any evidence of cracks, nonfunctioning (clogged)
structural weep holes, uncontrolled seepage, erosion damage, debris, or undercutting of the subject concrete structures.
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Audit Conclusion / Findings
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FERC will prepare the dam safety audit report, for-the NRC Dam Safety Officer. This report will list the audit findings, conclusions and recommendations and after review and approval a copy will be issued to the licensee. Audit observations and findings mentioned at the exit interview included the following:
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o In general, the CWSP dam / dikes.and its associated structures and instrumentation were found to be operating safely as designed and maintained in good condition.
o-The downstream dam failure hazard potential was classified as " Low".
o The following routine maintenance recommendations were suggested by the audit team to enhance existing dam conditions and the instrumentation monitoring program;
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Fill and compact an apparent animal borrow existing a few feet above pond level at the South groin area.
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Fill and compact some slight erosion areas and a hole where old instrumentation casing sheared off on'the-downstream side, left dike area.
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At the downstream toe in the vicinity of STA 28+75 -
30+25, a wet mushy area exists which could be minor i
seepage. Although not deemed serious at this time it should be monitored during routine inspections to
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ensure conditions do not worsen.
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Observation wells Nos.17C and 13 do not appear to be functioning properly and their reliability should be checked and evaluated.
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Repair / replace a few relief well manhole rims that are badly corroded or partially missing.
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Periodically check all relief well manholes for foreign items obstructing flow. A few relief wells
manholes contained various debris and relief well
- 10's header pipe was partially clogged with a plastic bag.
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No seepage flow was evident from either of the
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8-inch perforated steel chimney drain pipes that drain to the central manhole; however, water existed in the manhole and was flowing to the 12-inch steel header pipe which -
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drained to the downstream drainage ditch. The licensee may wish to investigate this further, checking to see if the chimney drains are possible clogged and not functioning.
- The licensee has written Shop Work Orders to address the routine
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maintenance recommendations identified by the audit team.
The final FERC audit report may contain additional findings, and
in addition some of the findings listed above may be revised after
final evaluation.
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Followup on 10 CFR Part 21 (36100), and Licensee Event Report Items
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(92700)
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(Closed)
P2191-03, (Both Units), Part 21 report from Rockbestos
concerning KS-500 silicone rubber activation energy values for Firewall i
GR silicone rubber insulated cable and Firezone R special purpose cable.
Farley purchased two reels of this cable under purchase order FNP2-842, (site reel Nos. 6111 and 6112). Approximately 1645 ft. of site reel No. 6112 was installed by CWR2-59.21 for the containment
hydrogen recombiner 2A and 2B heater penetrations. No footage from site
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reel No. 6111 has been used. The remaining footage on site reel Nos.
6111 and 6112 has been designated for non safety related applications.
i Nuclear Support evaluated the acceptability of the subject Rockbestos
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cable installed. The inspector reviewed Nuclear Support's letter (NDS-91-2362) dated April 2,1991, J.E. Garlington to D. Morey which describes their conclusions on this matter. Nuclear Support's
' valuation determined that the subject Part 21 does not apply to FNP.
Their review determined that the cable installed as Unit 2 hydrogen recombiner thermocouple cable is not required to be environmentally qualified. Also, even if this cable was in an application requiring
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environmental qualification, FNP's required environmental parameters (18.7 megarads TID and 120 degrees F nominal inside containment) are significantly less than the 150 megarads TID and 125 degrees C
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continuous ambient temperature mentioned in the Rockbestos letter as.
being the threshold for concern. This item is closed.
(Closed)
LER-348/91-09, Reactor trip caused by lightning induced deenergization of the "lB" startup transformer. The licensee installed new improved design lightning arrestors (Type VN,180 KV Station Class Metal Oxide) on startup transformer "lB" to improve their lightning protection capability. This work was completed during Unit l's eleventh (
refueling outage under MWR 247657 and determined functionally acceptable
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on November 6, 1992. This item is closed.
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Exit Interview (30703)
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The audit / inspection scope and findings were summarized on February 3, 1993, with those persons indicated in paragraph 1.
The auditors
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described the areas examined and discussed the audit findings.
No dissenting comments were received from the licensee. The licensee
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did not identify as propriety any of the materials provided to or reviewed by the auditors during'the audit.
L. Stinson was informed by the inspector on February 5, 1993 that the items discussed in paragraph 3 were closed.
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5.
Acronyms and Initialisms C
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Centigrade
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CFR
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Code of Federal Regulations CWR
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Construction Work Request
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i Cooling Water Storage Pond
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CWSP
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Division of Reactor Projects F
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Fahrenheit
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Federal Energy Regulatory Commission l
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Farley Nuclear Plant
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Kilovolts
LER
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Licensee Event Report-MWR
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Maintenance Work Request NMSS -
Office of Nuclear Materials Safety & Safeguards
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NRC
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Nuclear Regulatory Commission NRR
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Office of Nuclear Reactor Regulation l
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Region II, Atlanta Ga.
SCS
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Southern Company Services-i SNC
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Southern Nuclear Operating Company TID
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Total Integrated Radiation Dose j
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