ML14181A942
| ML14181A942 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 08/14/1997 |
| From: | Richards S NRC (Affiliation Not Assigned) |
| To: | Keenan J CAROLINA POWER & LIGHT CO. |
| Shared Package | |
| ML14181A943 | List: |
| References | |
| 50-261-97-201, NUDOCS 9708280095 | |
| Download: ML14181A942 (6) | |
See also: IR 05000261/1997201
Text
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D.C. 2055-0001
August 14,
1997
Mr. J. S. Keenan, Vice President
Carolina Power & Light Company
H. B. Robinson Steam Electric Plant,
Unit No. 2
3581 West Entrance Road
Hartsville, South Carolina 29550
SUBJECT:
DESIGN INSPECTION OF H. B. ROBINSON STEAM ELECTRIC PLANT, NO. 2
(NRC INSPECTION REPORT NO. 50-261/97-201)
Dear Mr. Keenan:
From April 7 through May 23, 1997, the staff of the U.S. Nuclear Regulatory Commission
(NRC), Office of Nuclear Reactor Regulation (NRR), performed a design inspection of the H.B.
Robinson Steam Electric Plant, Unit No. 2 (HBR) auxiliary feedwater (AFW) and safety injection
(SI) systems, including their support systems. The purpose of the inspection was to evaluate
the capability of the selected systems to perform safety functions required by their design
bases, the adherence of the systems to their design and licensing bases, and the consistency of
the as-built configuration with the updated final safety analysis report (UFSAR).
. The inspection findings were discussed during a public exit meeting on June 12, 1997, and are
presented in the enclosed report. The team concluded that the systems could perform their
safety function, design documentation adhered in most cases to design and licensing bases,
and that the UFSAR generally reflected the current installed state of systems and how they
were maintained and operated. However, the team identified a number of issues that indicate
that additional management attention is warranted in the engineering area.
During the inspection the team identified a concern with the net positive suction head (NPSH)
requirements with the SI and residual heat removal (RHR) pumps. A hydraulic analysis was
performed subsequent to the inspection. You discovered a potential NPSH problem with SI
pump C and reported it to NRC in accordance with 10 CFR 50.72 on June 27, 1997.
Subsequently you identified actual NPSH problems with SI pumps B and C for a large break loss
of coolant accident (LBLOCA) as stated in LER 97-08. You have undertaken several immediate
corrective actions, including raising the refueling water storage tank (RWST) level. The
hydraulic analysis is still ongoing for the RHR pumps.
You discovered as the result of the team's inquiries that the redundant autostart cables for SI
pumps A and C were routed in the same raceway in violation of your electrical separation
criteria. You declared SI pump C inoperable, immediately placed the installed spare pump B in
service, and implemented a modification to provide correct separation subsequent to this
inspection. You advised the NRC of this discrepancy in accordance with 10 CFR 50.72 on May
21, 1997.
.
9708280095 970814
PDR ADOCK 05000261
G
Mr. J. S. Keenan
-2
The team identified that you had not reported significant PCT changes as required by 10 CFR
50.46. Prior to the inspection you reported significant PCT changes for only the most limiting
transient for all the evaluation models, whereas you should report them for the limiting
transient of each evaluation model and its applications. The NRR technical staff is still
evaluating a potent ial unreviewed safety question (USQ) with regard to your commitments
about the transfer to cold leg recirculation following a LBLOCA.
The team found deficiencies with the improper slope of instrument sensing lines, the exclusion
of the seismic uncertainty term in calculations for safe shutdown and accident mitigation
instrumentation, and with verification of the closure capability of the accumulator isolation
valves if a LOCA occurred while filling the accumulators.
Weaknesses were also identified concerning updating and control of calculations,
nonconservative design inputs and assumptions, and incorporating design bases into
maintenance and test procedures. In addition, the team noted deficiencies and inconsistencies
in the USFAR, procedures, design basis documents, systems descriptions, calculations,
drawings, and other documents.
You have implemented appropriate measures to address the immediate concerns identified by
the team. For the other issues, you have initiated reviews and corrective actions including
further evaluations where deemed appropriate. The team concluded that, although a number of
problems were noted, the reviewed systems generally adhered to their design and licensing
bases, and their as-built configurations were generally consistent with the UFSAR.
In order for the NRC to coordinate follow-up actions, please provide within 60 days of receipt
of this letter a schedule for completion of your corrective actions for the open items listed in
Appendix A of the enclosed report. As with all NRC inspections, we expect that you will
evaluate the applicability of the results of this inspection and the specific findings to other
systems and components. Please advise us of your considerations in this regard.
Any enforcement action resulting from this inspection will be handled by the NRC Region II
office through separate correspondence.
Mr. J. S. Keenan
-3
In accordance with Section 10 CFR 2.790(a), a copy of this letter and the enclosure will be placed
in the NRC Public Document Room. Should you have any questions concerning the attached
inspection report, please contact the project manager, Ms. B. L. Mozafari at (301) 415-2020, or
the inspection team leader, Mr. E. A. Kleeh at (301) 415-2975.
Sincerely,
Stuart A. Richards, Chief
Special Inspection Branch
Division of Inspection and Support Programs
Office of Nuclear Reactor Regulation
Docket No. 50-261
Enclosure:
NRC Inspection Report No. 50-261/97-201
cc: See next two pages
H.B. Robinson Steam Electric Plant, Unit 2
cc:
Mr. William D. Johnson
Mr. Mel Fry, Acting Director
Vice President and Senior Counsel
N.C. Department of Environment,
Carolina Power & Light Company
Health and Natural Resources
Post Office Box 1551
Division of Radiation Protection Raleigh,
North Carolina 27602
3825 Barrett Dr.
Raleigh, North Carolina 27609-7721
Ms. Karen E. Long
Assistant Attorney General
Mr. Robert P. Gruber
State of North Carolina
Executive Director
Post Office Box 629
Public Staff - NCUC
Raleigh, North Carolina 27602
Post Office Box 29520
Raleigh, North Carolina 27626-0520
U.S. Nuclear Regulatory Commission
Resident Inspector's Office
Mr. Max Batavia, Chief
H. B. Robinson Steam Electric Plant
South Carolina Department of Health
2112 Old Camden Road
Bureau of Radiological Health
Hartsville, South Carolina 29550
and Environmental Control
2600 Bull Street
Regional Administrator, Region 11
Columbia, South-Carolina 29201
U.S. Nuclear Regulatory Commission
Atlanta Federal Center
61 Forsyth Street, SW, Suite 23T85
Ms. D. B. Alexander
Atlanta, Georgia 30303
Manager
Performance Evaluation and
Mr. J. W. Moyer
Regulatory Affairs
Plant General Manager
Carolina Power & Light Company
Carolina Power & Light Company
412 S. Wilmington Street
H. B. Robinson Steam Electric Plant,
Raleigh, North Carolina 27601
Unit No. 2
3581 West Entrance Road
Hartsville, South Carolina. 29550
Mr. Milton Shymlock
U. S. Nuclear Regulatory Commission
Public Service Commission
Atlanta Federal Center
State of South Carolina
61 Forsyth St., SW, Suite 23T85
Post Office Drawer 11649
Atlanta, Georgia 30303
Columbia, South Carolina 29211
Mr. J. S. Keenan, Vice President
Carolina Power & Light Company
H. B. Robinson Steam ElectricRPlant,
Unit No. 2
3581 West Entrance Road
Hartsville, South Carolina 29550
MrM TH M Wilkerson
Manager - Regulatory Affairs
V
Mr. H.
K. Chernoff
Carolina Power & Light Company
Supervisor, Licensing/Regulatory Programs
H. B. Robinson Steam Electric Plant,
Carolina Power & Light Company
Unit No. 2
H. B. Robinson Steam Electric Plant,
3581 West Entrance Road
Unit No. 2
Hartsville, South Carolina 29550-0790
3581 West Entrance Road
Hartsville, South Carolina 29550
Distribution:
NR(. and Local PDRs
Docket Files 50-261
PSIB R/F
SJCollins, NRR
BWSheron, NRR
FPGillespie, NRR
LAReyes, RII
SARichards, NRR
DPNorkin, NRR
CERossi, NRR
GEEdison, NRR
BABoger, NRR
BLMozafari, NRR
MBShymlock, RII
BBDesai, SRI
TTMartin, AEOD
Regional Division Directors
Inspection Team
PUBLIC
OGC (3)
IS Distribution
SPSB, NRR
Al*QO