ML19320B305
| ML19320B305 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/08/1980 |
| From: | Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Youngblood Office of Nuclear Reactor Regulation |
| References | |
| 600, NUDOCS 8007100159 | |
| Download: ML19320B305 (1) | |
Text
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VinorxrA ELucTurc Axu Powan CoxrAxv R tcuMoxo,VinorszA 20261 July 8, 1980 Mr. Harold R. Denton, Director Serial No.600 Of fice of Nuclear Reactor Regulation N0/DWL:ms Attn:
Mr. B. Joe Youngblood, Chief Docket No. 50-339 Licensing Branch No. 1 License No. NPF-7 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
NORTH ANNA POWER STATION UNIT 2 POWER ASCENSION PROCEDb1ES We have reviewed the comments on our power ascension procedures provided by J
Westinghouse in their letter dated June 16,1980 (NAW-3585) and have incorpo-i rated appropriate comments into the subject procedures.
This action satisfies i
the requirements of item I.C.7 of NUREG-0660.
Very truly yours, l'
'R B. R. Sylvia V Marager - Nuclear Operations and Maintenance cc:
Mr. J. P. O'Reilly - Region II Mr. E. H. Webster - NRC/ North Anna a
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W.s i June 16, 1980 Mr. R. H. Engelken, Director U. S. Nuclear Regulatory Co==ission Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd.
Walnut Creek, CA 94596
Dear Sir:
Attached is Supple =ent 1 to Licensee Event Report (LER) 80-07 which was transmitted to you by =y letter of May 30, 1980.
Supple =ent 1 provides a description of our engineering review pursuant to LER 80-07, Attachment 3.
Also provided are descriptions of reportable nonconformances found during that review and the results of evaluations As of such nonconfor=ances performed by Bechtel Power Corporation.
indicated in this supple ent, all nonconforming conditions net evaluated as acceptable vill be corrected before resumption of power operations.
Sincerely,
/
DJ3/LVE/1=n/4jed5B27 Attach =ents Mr. Robert A. Clark, Chief c:
Operating Reactors Branch No. 3 Division of Licensing i
Mr. Lynn Frank, Director State of Oregon Depart =ent of Energy 5i/
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l-SUPPLEMENT 1 LICENSEE EVENT REPORT 80-07 Following identification of the nonconfor=ance for the connection of the Auxiliary Building south wall, an engineering review was initiated to in the Plant, any s1=ilar identify from design drawings, and then inspect nontypical top-of-wall interf ace conditions where connection require =ents specifically detailed and where application of typical details were not could be subject to =isinterpretation. The scope of this review included all =asonry walls in safety-related structures in the Plant (single wythe, double wythe and co=posite). Following co=pletion of the investigation based on the drawing review, the inspection effort was extended to verify the top-of-wall interf ace of all =asonry walls in the Plant.
Visual Inspection of Top of Masonry Wall Structural Connection A visual inspection of details of the structural connections at the top of =asonry walls was perf ormed by PGE Registered Civil Engineers between May 28 and June 13.
Inspections consisted of visual observation of the interface at the top of each wall with the structural ele =ents (usually a floor slab and/or structural steel framing). All =asonry walls (composite, double wythe, and single wythe) in the Plant were inspected on both sides, except at the following inaccessible locations:
1.
Locations of high radiation where remote inspection was not prac-ticable. These locations were inside the spent resin storage tank roo=, de=ineralizer co=part=ents, and most of the filter cells. Two of the filter cells were inspected inside. The top of wall inter-face conditiot-on the outside at these locations were inspected.
2.
One location where physical access sufficient for direct or remote visual inspection was not possible. The outside of the Auxiliary concrete Building north wall along column line 46 behind the precast For this location, con-panels and siding had no physical access.
the struction photographs were reviewed to provide assurance that
=asonry construction was co=pleted as required.
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Observed connection details were compared to details on the design drawings.
The majority All non-conforming conditions identified were documented.
of nonconformances only required completion of small areas of grout or cortar topping and were repaired. The following items having safety significance, for which the interface conditions were ident.ified as differing from design drawing details, were further evaluated:
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Item No. 1 I
Fuel Building, elevation 77 f t, west wall of Room Wall
Description:
I 259 between column lines 41 and 46; cocposite wall 2 f t-3 in.
thick.
Nonconformance With Design Details: One masonry wythe not grouted to slab above with result that reinforcing steel dowels from slab to wythe exposed. Re=ainder of wall section is complete.
Cause of Occurrence: Incomplete =asonry construction.
Grout void section to complete masonry wythe connection.
Disposition:
Corrective action completed.
Status:
The wall was considered to be a minor shear wall Safety Evaluation:
The nonconformance results in the capa-in LER 78-13 evaluations.
bility to transfer in-plane SSE loads to the wall from the slab above which is less than that which would have otherwise been developed.
The wall in i e as-found condition would have been capable of resist-ing the reduced in-plane load. The re=ainder of the load would have been transferred to other shear walls which have adequate excess capacity to resist it.
Out-of-plane SSE loads on the wall would have The corrective been resisted by the wall in the as-found condition.
action has restored the original design capacity.
Item No. 2 Fuel Building, elevation 77 ft, portion of south wall Wall
Description:
of Room 260 between column lines B and C; cocposite wall 2 f t-10 in.
thick.
Nonconfor=ance With Design Details: Partial height void in cell fill grout Remainder of one masonry wythe and void in beam encase =ent on one side.
of wall section is complete.
Cause of Occurrence: Incomplete casonry construction.
. Disposition: Grout void areas.
Status: Corrective action completed.
Safety Evaluation: The wall was included as a minor shear wall in evalua-tions for LER 78-13.
In the as-found condition, the wall's capability to resist in plane SSE loads would have been less than that provided by the design detail, but the wall would have developed sufficient capacity to resist the reduced loads. The excess load would have been transferred Out-of-to adjacent walls which have sufficient excess capacity.
plane SSE loads on the wall would have been resisted by the wall in the as-found condition. Corrective action modifications have restored the original design capacity.
Ites No. 3 Wall
Description:
Auxiliary Building, elevation 77 ft, south wall of Room 216 between column lines E and F; composite wall 2 ft-10 in, thick.
Nonconformance With Design Details: Some reinforcing steel dowels from the slab above to one masonry wythe are exposed due to structural steel beam interference.
Cause of Occurrence: Interference not corrected during construction.
Disposition: Repair by welding dowels to bottom flange of beam and grout dowel pockets.
Status: Corrective action scheduled for completion June 18, 1980.
Safety Evaluation: The wall was included as a minor shear wall in evalua-tions for LER 78-13.
The identified condition reduces the wall's capacity; however, the wall in the as-found condition has ade-quate capacity to resist the required in plane and out-of-plane SSE loads. The corrective action will restore the original design ca pa city.
Item No. 4 Wall
Description:
Fuel Building, elevation 45 't, east wall of Room 236 between column lines 56 and 59; composite wall 1 f t-6 in thick.
Nonconformance: One masonry wythe not completed to slab above.
The wall section was completed to the bottom flange of the structural steel member.
Cause of Occurrence: Design details did not make clear that outer =asonry l
wythe should be constructed to slab sbove.
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Disposition: On the basis of the safety evaluation below, a wall modifi-cation, which would be very difficult to construct, is not required.
Safety Evaluation: The wall was considered as a minor shear wall in LER 78-13 evaluations. The nonconformance results in in plane and out-of-plane loads not being transmitted into the wall from the slab above. The wall has sufficient capacity to resist its own inertia loads in the event of an SSE. The in-plane load that would have other-vise been resisted by the wall will be transmitted to adjacent shear walls which have adequate capacity to resist the load. Out-of-plane SSE loads on the wall can be resisted by the wall in the as-found condition.
Itec No. 5 Wall Descripcion:
Auxiliary Building, elevation 45 f t, north wall of Room 171 between Column Lines H and K; heavy weight 14-in.
double wythe wall.
i Nonconfor=ance With Design Details: Masonry is co=pleted to sof fit of slab above as required, but continuous steel angles each side top of wall, per approved Field Change Request, are not provided.
at Cause of Occurrence: Inco= plate const ruction.
Disposition: Provide positive connection from top of wall to slab above.
Status: Corrective action scheduled for completion June 18, 1980.
Safety Evaluation: The wall was considered to be a minor shear wall in LER 78-13 evaluations. In the as-found condition, no in plane loads could be transferred to the wall, and the wall has sufficient capacity to resist its own in-plane inertia loads in the event of an SSE.
Adjacent shear walls have sufficient excess capacity to resist the load transfer. Out-of-plane SSE loads can be resisted by the wall in the as-found condition. The corrective action will restore the wall's capacity to resist the design loads.
in addition to the nonconfor=ancs described above, in the course of its investigacions Licensee identified an opening in the east wall of the Con-trol Building along coluen line N, above the entry portal to the counting room at elevation 45'.
This portal is not terminated by a lintel, as previously assumed. Instead the portal continues to the floor slab above While this to allow for some air ducts concealed above the false ceiling.
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. opening has no effect on the seismic analyses of the Complex previously submitted under LER 78-13, it does present a cinor reduction in capacity (about 400 kips out of 3800 previously reported) in this local area.
Since the required SSE demand in this arc r is only 2400 kips, the reduced capacity still provides sufficient strength above de=and and therefore corrective action is not required in order for this wall to perform properly in 'the event of an SSE.
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James W. Durnam Portland General ElectricCompany Vice Pres; cent and General Counsel Legal Department Senior Assistant General Counsel.
Alvin Alexanderson Warren Hastings June 16, 1980 Assistant General Counsel.
Roland A Johnson Ronald W. Johnson Dattas A Marckx Steven F. McCarrel Marshall E. Miller, Esq., Chairman Atomic Safety rnd Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Dr. Kenneth A. McCollom, Dean Division of Engineering, Architecture & Technology Oklahoma State University Stillwater, Oklahoma 74074 Dr. Hugh C. Paxton 1229-41st Street Los Alamos, New Mexico 67544 Gentlemen:
On May 19, 1980, Licensee submitted to the NRC, Region V, Office of Inspection and Enforcement, a written report regarding discovery of an Auxiliary 3uilding wall which was not adequately connected to the floor slab above it.
Copies of this report were served on the Board and all parties to the Control Building proceeding. Pursuant to the requirements of the Technical Specifications of License NPF-1, on May 30, 1980, Licensee submitted Licensee Event Report (LER) 80-07 to the NRC, Region V.
That report contained a more detailed description and analysis of the occurrence, the cause of the occurrence and a des-cription of and basis for the corrective action being taken.
Licensee Event Report 80-07 was served on the Board and all parties to the Con-trol Building proceeding on June 2, 1980. Licensee has today filed with the NRC, Region V, Supplement No. I to LER 80-07.
This supplement provides a detailed report on the results of the field examinations which were completed on June 13, 1980.
It also contains the results of the corresponding engineering evaluations performed pursuant to LER 80-07.
On June 2, 1980, the Board issued an order requesting the Licensee to provide by affidavit certain information concerning this occurrence.
The Licensee had intended to respond to the Board's request during the week of June 9,1980; however, difficulty in obtaining access to a few locations delayed completion of the field reviews to June 13, 1980.
In light of this delay, Licensee's response is being delivered to the Board and parties by expedited service.
8007 $dPO () Ei j 1300 Willamette Center 121 S.W. Salmon Street, Portland, Oregon 97204 (503)220 3000
W M M bi AisW4 Messrs. Miller, McCollom and Paxton June 16, 1980 Pace 2 The attached affidavits of Mr. Donald J. Broehl, Assistant Vice Presi-dent of Engineering-Construction for Portland General Electric Company and Dr. William H. White of Bechtel Power Corporation contain Licensee's response to the Board's request.
Mr. Broehl's affidavit des.ribes the cause of the inadequate connection of the Auxiliary Building wall and the now completed examination of other walls to determine the extent of deficiencies at the top-of-wall interfaces. The affidavit also indicates the manner by which the identified deficiencies will be corrected and the schedule for completion of such corrective action.
Dr. White's affidavit describes the limited significance of such deficiencies to the structural adequacy of the Complex, both before and aftar the completion of corrective actions.
Sincerely, d
r Ronald W. Johnson Assistant General Counsel Portland General Electric Company RWJ/4sa4B16 Attachments c:
Control Building Service List
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