IR 05000280/1990036
| ML18153C490 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/19/1990 |
| From: | Fredrickson P, Holland W, Tingen S, York J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML18153C489 | List: |
| References | |
| 50-280-90-36, 50-281-90-36, NUDOCS 9101140010 | |
| Download: ML18153C490 (4) | |
Text
Report Nos.:
50-280/90-36 and 50-281/90-36 L~censee:
Virginia Electric and Power Company 5000 Dominion Boulevard Glen Allen, VA 23060 Docket Nos.:
50-280 and 50-281 License Nos.:
DPR-32 and DPR-37 Facility Name:
Surry 1 and 2 Inspection Conducted:
October 28 through December 11, 1990 Inspectors:
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W:E.Ho 11 fric(~striior Res i ~ector J. \\,J. York, Resident Inspector S:. ~:,/g,.n,~es~nt Inspecto~ -
Approved by:
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A::: a.P-J--1. =if:~
P. re r1c son, Section 1ef Division of Reactor Projects SUMMARY Scope:
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{30t/;tfa D~~V This special resident inspection was conducted on site in the area of service water flow testing of recirculation spray heat exchangers. During flow testing prior to this inspection period, (Inspection Report 280, 281/90-30) degradation of the service water flowpath due to macrofouling had been identifie Results:
An apparent violation of TS 3.4.2 was identified with regards to the recirculation spray system being inoperable (paragraph 2) *...
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REPORT DETAILS Persons Contacted Licensee Employees
- R. Bilyeu, Licensing Engineer
- H. Blake~ Superintendent of Nuclear Site Services*
- R. Cherry, Licensing Engineer
- A. Hall, System Engineer
- E. May, Supervisor, Mechanical Engineering, Corporate
- M. *Kansler, Station Manager
- J. McCarthy, Superintendent of O~erations
- A. Price, Assistant Station Manager
- R. Rasnic, Supervisor, Mechanical Engineering, Corporate
- E. Smith, Site Quality Assurance Manager
- T. Sowers, Superintendent of Engineering
- G. Woodzell, Senior Training Instructor 0th.er licensee employees contacted included engineers, technicians, operators, mechanics, security force members, and office personne NRC Resident Inspectors
- W. Hollandi Senior Resident Inspector J. York, Resident Inspector
- S. Tingen, Resident Irispector
- Attended exit intervie Acronyms and ini.tialisms used throughout this report are listed in the last paragrap.
Flow Testing of the Service Water Side of Unit 1 Recirculation Spray Heat Exchangers Band C (61726)
On October 23, the licensee declared that Units 1 and 2 RSHXi were inoperabl TS 3.4.2 requires that the recirculation spray subsystem (including the recirculation *spray heat exchangers) be operable whenever the unit's RCS temperature or pressure exceeds 350 degrees For 450 psig, respectivel With the Unit 2 RSHXs _cor.isidere,d.. j_n9p~r_able,_::;.TS 3,.. required that the unit be placed in hot shtitdown withih six hburs and in
. cold shutdown within 30 hour3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> On October 23, the licensee shutdown Unit 2 from 100% powe Unit 1 was in day 17 of *a *re:fuel ing outage_ and, therefore, TS 3.4.2 was not applicable in this conditio The RSHXs were declared inoperable because testing of Unit 1 RSHXs Band C accomplished on October 15 and 16, revealed that SW flow rates through the heat exchangers were lower than the design flow rate The reduced SW fl ow rates were *determined to be caused by macrofoulJng of the RSHXs. *
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- Testing of Unit 1 RSHXs B and C is discussed in Inspection Report 50-280,281/90-3 The condition of inoperable Units 1 and 2 RSHXs had been in existence for an unknown period of time prior to October 2 Inoperability of the Units 1 and 2 recirculation spray subsystem prior to October. 23, is identified as an apparent violation of TS 3. (280,281/90-36-0l).
Corrective actions for the low SW flow rates involved inspection and cleaning of the Units 1 and 2 SW supply lines to the RSHXs and coating the Unit 1 RSHX supply lines with an epox The Unit 2 SW supply lines up to the SW-203 valves are scheduled to be coated with epoxy during the upcoming refueling outage in April, 199 Corrective action also involved maintaining the piping between the Unit 1 SW-103 and 104 valves and Wnit 2 SW-203 and 204 valves in partial wet-layup to minimize the surge into the heat exchangers when SW flow is initiated in order to reduce the dislodging of marine growth and corrosion product in the supply pipin These corrective actions are considered short-term because the cooler temperatures of the SW during the winter months do not support marine growt The licensee is in the process of developing corrective action to address marine growth concern On November 7 and 8, the inspectors witnessed flow testing of Unit 1 RSHXs Band C in accordance with l-ST-290, Recirculation Spray Heat Exchangers Service Water Flow Test, dated October 5, 199 This test was performed to verify that the corrective actions to increase SW flow through the RSHXs were adequate. The inspectors monitored the test from the control room, safeguards building, and turbine buildin At the initiation of the test, flows of approximately 12,000 gpm and 11,500 gpm were measured for the B and C RSHXs, respectively. *After several hours, flow decreased to 10,000 gpm and 9,500 gpm due to the loss of prime in the discharge tunnel. These flowrates remained relatively c~nstant throughout the remainder of the test, and with the exception of control room flow indication~ the test results were considered to be satisfactory. During the test, control room indication for SW flow through the B and C RSHXs was inaccurat FT-SW-1068 tracked actual flow through B RSHX at approximately 75% of the actual valu FT-SW-106C indicated approximate flow through C RSHX for the first ten minutes of the test, but then its indication decreased substantially. The instrument piping was blown down twice during the test and then tracked actual flow through C RSHX at approximately 65% of the actual valu During actual accident conditions, radiation levels in the lower level safeguards building would not permit entry to blowdown these instruments 1 ine FT-SW-1058, which measures combinect flow thro1..1gh ~B-and C RSHXs, initially oscillated widely at an approximate value of 12,000 gpm, and then over the next several hours gradually increased to its maximum value of 16,000 gp At the completion of the test, with SW flow through the RSHXs secured, a 11 three of these fl ow instruments sti 11 indicated flow was presen n.:sw-1058 was pegged high at 16,000 gpm, FT-SW-106C indicated 3,680 gpm and FT-SW-1068 indicated 2,360 gp As a result of the inaccurate control room indication of SW through the RSHXs, the licensee revised the EOPs to ensure that control room SW flow
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instrumentation is not relied on to ensure that a given RSHX is in servic In addition, the licensee has initiated an engineering study to evaluate design options to improve operability of the Units 1 and 2 RSHX SW inlet and outlet flow instrumentatio The completion date for this study is currently scheduled for April 15, 199 This item was previously identified as an inspector followup item in Inspection Report 50-280, 281/90-3 This IFI will remain ope.
Exit Interview The inspection scope and results were summarized on December 13, 1990 with those individuals identified by an asterisk in paragraph 1.. The following summary of inspection activity was discussed by the inspectors during this exit:
An apparent violation of TS 3.4.2 was identified with regards to the RSHXs being inoperable (280,281/90-39-0l).
The licensee acknowledged the inspection conclusions with no dissenting comment The 1 i censee did not identify as proprietary any of the materials provided to or reviewed by the inspectors during this inspectio.
Index of Acronyms amd Initialisms EOP F
GPM IFI PSIG RCS RSHX SW TS EMERGENCY OPERATING PROCEDURES FAHRENHEIT GALLONS PER MINUTE INSPECTOR FOLLOWUP ITEM POUNDS PER SQUARE INCH GUAGE REACTOR COOLANT SYSTEM RECIRCULATION SPRAY HEAT EXCHANGER SERVICE WATER TECHNICAL SPECIFICATIONS