ML20206D490
| ML20206D490 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/13/1986 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Rubenstein L Office of Nuclear Reactor Regulation |
| References | |
| 86-205, NUDOCS 8606200020 | |
| Download: ML20206D490 (20) | |
Text
r VIMOINIA ELECTRIC AND PowEn COMPANY Ricnwoxn, Vino NIA 20261 W. L. Stuwant wuc a o em v one June 13, 1986 Mr. Harold R. Denton, Director Serial No.86-205 Office of Nuclear Reactor Regulation E&C/MDS:jb:480C Attn: Mr. Lester S. Rubenstein, Director Docket Nos.
50-338 PWR Project Directorate #2 50-339 Division of PWR Licensing-A License Nos. NPF-4 U. S. Nuclear Regulatory Commission NPF-7 Washington, D.C.
20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 REQUEST FOR RELIEF FROM HYDROSTATIC TEST REQUIREMENTS NEk SERVICE WATER SPRAY SYSTEM PIPING As part of the ongoing program to upgrade the Service Water System at North Anna, Virginia Electric and Power Company has begun to implement the Service Water Reservoir Improvements project. The scope of this project includes installation of a new Service Water Reservoir (SWR) spray and bypass piping l
system which will replace the existing fiberglass spray system currently in operation. A complete description of the replacement system is outlined in the Design Sumary Report (Enclosure 1). As outlined in this enclosure, the new reservoir spray and bypass piping system will be constructed of externally coated carbon steel piping and stainless steel spray nozzles to be installed in i.
the presently unused central and western portions of the SWR. The spray piping in the SWR will be supported above the surface of the water on a combined concrete footing - galvanized steel support structure. The bypass piping will 1
be submerged in the reservoir and supported by galvanized structural steel attached to the new Service Water Valve House. The new valve house will provide tornado missile protection and seismic support for the safety-related motor-operated valves and associated piping and equipment required to operate j
the new spray and bypass system. The valve house will be created by completing the partially constructed Units 3 and 4 Service Water Pump House. Service water will enter the valve house piping through two new buried return headers which will tie-in to the existing buried return headers approximately 300 feet from the Units 1&2 Service Water Pump House.
The overall Service Water Reservoir Improvements program is being implemented under the Repair and Replacement rules outlined in ASME Boiler and Pressure Vessel, Code, Section-XI-Rules for Inservice Inspection of Nuclear Power Plant l
Components. North Anna Power Station Administrative Procedures reference specific editions and addenda of the code. Repairs and Replacements will meet the requirements of ASME Section XI 1980 Edition through Winter 1981 Addenda, t
8606200020 860613 ADOCKOSOOg8 M
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Subsections IWA, IWB, IWC, and IWD 4000. For determining the suitability of replacements, the requirements of Subsections IWA, IWB, IWC, and IWD 7000 of the 1980 code and subsequent addenda are used for guidance.
Article IWA-7210 of Section XI (1980) states that replacements must meet the requirements.of.the original construction code for the component or part being replaced. The original construction code for the Service Water System is ANSI (formerly USAS) 831.7-1969 Edition with Addenda through 1970. The Service Water System is governed by Class III requirements of that code for design, materials, dimensions, fabrication, assembly, erection, inspection and testing.
For Examination and Testing of Class III nuclear piping, B31.7 refers to the requirements of USAS B31.1-1967 Edition with additional NDE of welds as described in the 1970 Addenda of B31.7. As part of the examination and testing requirements, 831.1 Chapter VI, Paragraph 137 requires leak testing prior to initial operation. This leak testing may be accomplished through hydrostatic testing, pneumatic testing, initial service leak testing, vacuum testing or 100% radiography of all welded joints in an all welded system.
New piping and equipment (i.e. valves, expansion joints, fittings) being installed under the scope of this project, from the point of tie-in at the existing buried headers up to and including the new spray and bypass isolation valves in the new valve house, will be hydrostatically tested and/or inservice leak tested prior to initial operation.
(See Enclosure 2 for a layout of the proposed hydrostatic testing boundaries.)
For the spray and bypass piping downstream of the isolation valves out to the spray nozzles, hydrostatic testing will be difficult and impractical due to the system design. The spray piping is divided into eight arrays, each containing 104 two-inch horizontally threaded nozzle connections. Since each of these connections is located on nearly the same horizontal plane, it will be virtually impossible to ensure a fully vented, completely water filled system prior to hydrotest (i.e., with the nozzle connections temporarily capped).
It would be difficult to test the system with the nozzles in place because of the inability to effectively plug the smooth orifice outlet of the nozzle as well as the aforementioned venting problems.
The code (B31.1) allows an inservice leak test in lieu of a hydrostatic test when the hydrostatic test is not practicable.
In this case, it would also be difficult to demonstrate leak tightness of each welded joint by inservice leak testing due to the spraying action which would be present during array operation.
It should be noted that Section XI also requires inservice system pressure tests (i.e. hydrostatic tests) as part of the inservice inspection program.
North Anna Power Station Administrative Procedure ADM 10.5, Inservice Inspection Visual Examination Procedure VT-2, references the 1977 Edition including Addenda thru Summer 1979 of Section XI for system pressure test requirements. The code states that for open-ended portions of non-closed systems, the system pressure test is not required. Article IWD-5223(c) of the Winter 1977 Addenda reads, "For open ended portions of nonclosed systems, any test or observation during system operation that demonstrates unimpaired flow shall be acceptable in lieu of a system pressure test." Additional guidance is provided in later editions and addenda. Thg1980 Edition (Winter 1980 Addenda)
Article IWD-5223(d) reads:
"For open ended portions of discharge lines beyond the last shutoff valve in non-closed systems (e.g., service water systems),
f confirmation of adequate flow during system operation shall be acceptable in lieu of system hydrostatic test." Footnote 1 reads" "Open ended signifies free discharges that dissipate the transported fluid directly to the atmosphere (i.e., inside or outside containment structure)." Further guidance is offered under Class 2 requirements of that same edition and addenda. Article IWC-5222(d), Footnote 1 defines open ended as follows "... As an example, piping terminating in spray devices is considered open ended."
It is apparent that Section XI recognizes that hydrostatic testing of open ended systems, such as the spray and bypass piping downstream of the isolation valves, is not required to demonstrate the integrity of the piping system.
Prior to initial operation of the new system, a flow test will be conducted to ensure that adequate flow capabilities exist to support design basis analyses.
Welds in the spray and bypass piping will be 100% inspected by liquid penetrant methods in accordance with B31.7-1969 (with 1970 Addenda), Chapter 3-VI.
It should also be noted that the system downstream of the isolation valves has been designed to 100 psig which represents a highly conservative design pressure in this portion of the system.
In addition, the new service water piping added under the scope of this project will be incorporated, as appropriate, into the existing inservice inspection program.
In light of.these conditions, we request relief from the hydrostatic test I
requirements of B31.1 for the spray and bypass piping system downstream of the spray and bypass isolation valves. Based on the currently planned construction and installation sequence for the spray and bypass piping, we request that your review and approval be completed by September 1, 1986.
Inasmuch as the Service Water Reservoir Improvements will result in significant operational benefits and facilitate implementation of future inspections of the Service Water System, and since the omission of a hydrostatic test of the spray and bypass piping will not impair the integrity of the system, we solicit your expeditious review and approval of this relief request.
A check in the amount of $150.00 is enclosed as an application fee.
Ve y truly yours, b
t, hv W. L. Stewart Enclosures (1) Design Summary Report (2) System Flow Diagram
cc: Dr. J. Nelson Grace Regional Administrator NRC Region II NRC Senior Resident Inspector North Anna Power Station Mr. L. B. Engle NRC North Anna Project Manager PWR Project Directorate #2 Division of PWR Licensing-A
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ENCLOSURE 1 DESIGN SUMARY REPORT SERVICE WATER RESERVOIR IMPROVEMENTS NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 VIRGINIA ELECTRIC AND POWER COMPANY 15-MDS-583Ca-1
IMPROVED SERVICE WATER SYSTEM ASME2Section_XI Code Applicability The overall Service Water Reservoir Improvements program is being implemented under the Repair and Replacement rules outlined in ASME Boiler and Pressure Vessel Code,Section XI Rules for Inservice Inspection of Nuclear Power Plant Components. North Anna Power. Station Administrative Procedures reference specific editions and addenda of the code. Repairs and Replacements will meet the requirements of ASME.Section XI 1980 Edition through Winter 1981 Addenda, Subsections IWA, IWB, IWC, and IWD 4000. Where reference is made.to other subsections of the code,.the subsection requirements of ASME Section XI 1974 Edition through Summer 1975 Addenda apply. For determining the suitability of replacements, the requirements of Subsections IWA, IWB, IWC and IWD 7000 of the
,1980 code and subsequent addenda are used for guidance.
Article IWA-7210 of Section XI (1980) states that replacements must meet the requirements of the original construction code for the component or part being replaced. The original construction code for the Service Water System is ANSI (formerly USAS) B31.7-1969 Edition with Addenda through 1970. The Service Water System is governed by Class III requirements of that code for design, materials, dimensions, fabrication, assembly, erection, inspection and testing.
The design basis, system description, design evaluation, and components of the existing Service Water Systems are addressed in the Updated Final Safety Analysis Report Section 9.2.1.-
Reservoir Spray and Bypass System (Refer to Figures 1 & 2)
The new service water spray system consists of four pairs (eight total) of
. individually controlled spray arrays. Each pair of arrays is capable of handling 100 percent of the flow and heat load generated by one unit during normal operation and Design Basis Accident'(DBA) conditions. Additionally,.
either of the two main headers can handle 100 percent of the flow and heat load generated by both units during normal operation and DBA conditions. Therefore, even with the loss of a complete header,100 percent capacity remains available.
The new system has a total area of spray coverage of nearly 100,000 square feet. This is approximately 1.5 times as much as the existing system and represents approximately a.5 gpm per square foot spray loading. Additionally, the individual nozzle to nozzle spacing will be increased to a 10 foot minimum east-west spacing with the individual risers on 7 foot centers in the north-south direction. Also the center line of each of the eight arrays will be a minimum of 75 feet apart, providing increased fresh air flow between arrays which enhances cooling. The existing system nozzle spacing is 6 feet in the east-west direction with risers on 5 foot centers.
The new spray system has been designed using SPRAC0 Model 1751 nozzles, the same nozzles used on the existing spray arrays. These nozzles have been widely used for ultimate heat sink applications and a large data base exists to support performance analysis. NUREG-0733, Analysis of Ultimate-Heat-Sink Spray Ponds, specifically references the performance characteristics of the SPRACO Model 1751 nozzle.
15-MDS-583Ca-2
The improvements described in nozzle to nozzle spacing and areas of coverage lead to increases in spray efficiency. This allows the system to obtain a closer approach to ambient wet bulb temperature and thus lowers the bulk temperature of the reservoir.
The service water reservoir spray system has been designed and analyzed for operation of two units based on the occurrence of a loss-of-coolant accident on one unit with cooldown of the non-accident unit and simultaneous loss of offsite power to both units. The computer modeling and analysis techniques outlined in NUREG-0733 were used to model the system under meteorological conditions leading to worst case heat transfer and water loss phenomena.
The NUREG-0733 methodology first develops spray performance models based on system geometry and heat and mass transfer phenomena of spray droplets in an environment influenced by the spray system.
Drift loss fractions as a function of wind speed are also developed using spray drop ballistics. Results from these analyses form a basis for the spray performance model which is used to scan a long term (on the order of tens of years) weather record for a nearby meteorological station. This scan identifies worst case periods for heat transfer (cooling and evaporation) and water loss which are used to estimate maximum pond temperatures following the design basis accident.
Correction factors are applied to correlate available on-site meteorological data with the weather station data. Estimates of recurrence intervals of the design basis meteorology are also developed.
Results of the analysis indicate that service water supply temperature will be maintained at no greater than 110 F during the 30-day period following the DBA.
The maximum water loss that can be expected over a 30-day period following the DBA considering no makeup to the service water reservoir would be 10.9 million gallons which includes spray and surface evaporation, spray drift and seepage.
These figures represent the losses associated with two unit operation.
Previous analyses conducted by Ford, Bacon and Davis have considered two unit as well as four unit operation (i.e. with the SWR supplying Units 1 and 2 as well as the now-cancelled Units 3 and 4 service water systems).
A winter bypass system will be provided. This design provides complete bypassing of the spray arrays during the low flow, low heat load periods experienced in the winter months.
The spray piping is provided with self-draining capability in order to maintain a dry condition inside the spray piping during bypass operation. This is accomplished using drain holes at appropriate locations in the piping system.
The thermal performance analysis of the spray arrays during normal operation and DBA conditions has considered the flow that would be bypassed out of these drain connections.
The new sprey piping system is supported entirely above water level for ease of inspection and maintenance. The existing system has some portion of the piping system underwater requiring divers for certain inspection and maintenance procedures.
The branching and valving for the spray and bypass piping will occur inside the new service water valve house. The spray piping and bypass piping will enter the reservoir through the valve house and will require no piping interface with either the existing fiberglass spray piping or the exis Hng pump house.
15-MDS-583Ca-3
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The material of construction of the spray piping including the 18-and 20-inch headers is ASTM A106 carbon steel. The carbon steel will be protected from external corrosion by a three coat organic coating system. The coating system consists of a primer, intermediate coat and top coat of a polyamide epoxy. The spray nozzles will be Type 316L stainless. steel castings which will be threaded to the two-inch spray arms. These nozzles will not be coated.
The bypass piping is provided with the same external organic coating as described for the spray piping. The 24-inch bypass piping is ASTM A106 carbon steel and the 30-inch piping is ASTM A672 carbon steel.
The motor operated valves (MOVs) in the spray array supply line piping (18-inch) and bypass piping (24-inch) will be 316L stainless steel high performance butterfly valves with extended bonnets to Limitorque operators.
.These MOVs~are seismically and environmentally qualified. The bypass piping has redundant MOVs in series in order to satisfy single failure criterion (single failure of a bypass line MOV to close upon receipt of a safety injection signal) during the switchover from bypass to spray array operation, i
The spray array piping and bypass piping will be supported by seismically designed supports.
A 316L stainless steel check valve will be installed in each 24-inch bypass line between the MOVs. The check valves will prevent the possibility of backflow from the reservoir through the bypass headers, since the bypass headers enter the reservoir several feet below the reservoir high water elevation.
The valve house piping will include a vertically installed pressure balanced expansion joint in each 36-inch header at the point of interface between the buried piping and the valve house piping. These expansion joints will allow for differential settlement between the valve house and the buried piping as well as movement of the 36-inch headers in the horizontal direction.
Two new buried return headers will be provided between the new valve house and i
the existing buried return headers. The new buried return headers will be carbon steel lines with an exterior applied cold-set bitumastic coating. These lines will be cathodically protected. The two headers will branch into eight i
spray array lines total, each with a motor operated valve and two bypass lines total, each with two motor operated valves (as described above).
l A new electrical ductbank will be installed to connect the existing service
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water pump house to the new service water valve house. New power, fire protection, control and instrumentation cables will be routed in the new ductbank from the pump house to the new valve house. An existing ductbank will be utilized for new instrumentation and control cable to be installed between the pump house and the plant proper.
New Category I electrical power equipment (motor control centers (MCCs), motor 1
j operators, cable, etc.) will be Class IE, and seismically and environmentally qualified (IEEE 344 and 323).
New instrumentation will include:
temperature measurement in both 36-inch 4
return headers upstream of the bypass piping takeoff; flow measurement in both 36-inch return headers downstream of the bypass piping takeoff and in both 24-inch bypass headers; and pressure measurement in each of the eight spray 15-MOS-583Ca-4 i
array pipes downstream of the MOVs and in both of the two bypass pipes downstream of the M0Vs.
The radiation monitoring system will be designed to receive flow from the 36-inch heacers without the use of a pump. The radiation monitor will be mounted on the platform and will receive flow from the 36-inch headers as a result of the header pressure and the elevation change from the header to the radiation monitor.
Support Design The spray array piping will be supported by galvanized ASTM A36 structural members erected as braced frames on concrete footings founded at the top of the reservoir clay liner.
The support structures will be a QA Category I, Seismic Class I structure.
In the dynamic analysis of the support structure, the following items were considered:
a.
The mass of the structure itself b.
The hydrodynamic effects on submerged portions of the structure and foundations c.
Soil-structure interaction d.
The mass of the piping system e.
The effects of surface generated waves The support structures were designed in accordance with the load combinations and stress limits set forth in Section 3.8.4 of the Standard Review Plan, NUREG-0800.
In addition to pipe reactions (dead, live, thermal and seismic) the support structures were designed for the structure dead, live, thermal and seismic loads.
The support structures will transmit loads to the reinforced concrete foundations which will transmit the loads to the compacted clay liner and in-situ material below the liner. Samples of the liner material were taken for laboratory determination of the geotechnical design parameters. The foundations were sized such that under design load conditions, the allowable soil stresses are never exceeded.
New Service Water Valve House (Refer to Figure 2)
The partially completed North Anna Units 3 and 4 Service Water Pump House (SWPH) will be completed with modifications to utilize the structure as the new service water valve house for the service water reservoir improvement program.
The valve house is a QA Category I reinforced concrete structure. The building is founded on a layer of fill at the North-West edge of the SWR. The building is approximately 45'-0" wide by 58'-6" long with a 52'-0" height.
Approximately 40 percent of the building will be below water during high water level operation of the SWR.
15-MDS-583Ca-5
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A new structural platform, approximately 23 feet x 12 feet, will be installed l
to provide access to the eight spray array valve motor operators. A stepped i
landing will be designed to provide passage over the service water piping from the.inside of the valve house to the MOV access platform.
I
- An additional platform will be installed in the southeast section of the valve house to provide access to the 24-inch bypass piping in this location.
i Two outside access missile resistant doors will be'provided in the north wall of the valve house, one for the west bay and one for the east bay. One internal door will be provided for access between the east.and west valve house
. bays. The door opening in the wall dividing the. east bay will not be fitted with a door, as this opening will be used for ventilation purposes.
The heating and ventilation system for the valve house is comprised of two.100 l
percent redundant systems,'one system for the west bay of the valve house and one system for the east bay of the valve house. Two ceiling mounted electric i
heaters in each bay will provide heat for the valve house. Redundant ceiling mounted ventilation fans in each bay of the valve house provide ventilation air through wall-mounted louvers in each bay of the valve house. No heating or j
ventilation will be provided below the main operating floor with the exception of a ventilation fan for the South-East basement room (location of the bypass line MOVs and check valves).
The ventilation fans and louvers located above the main operating floor are i
seismically qualified and are supplied with safety related power. This insures i
that the valve house inside temperature will be kept below 120 F. prior to l
accident scenarios in order to protect the QA Category I MOVs and MCCs located in the valve house.
l The ventilation fans will be electrically load shedded for loss of offsite l
power, regardless of unit status. Loss of ventilation during these intervals will not'cause safety related equipment degradation.
L The valve house will be equipped with heat detectors which will alarm in the control room. This building contains a small quantity of combustibles which l
are not'sufficier.t to introduce a significant fire hazard. A fire inside the valve house will not impact existing post-fire (Appendix R) safe shutdown since loss of the service water reservoir spray system is already considered and the i
auxiliary service water system is used.
Electrical loads in the new service water valve house will be supplied from one
. of four new 480 V emergency busses. The new 480 V busses will be fed from existing emergency 480 V busses 1H1-3, IJ1-3, 2H1-3 and 2J1-3.
New Service Water Tie-In Vault (Refer to Figure 3)
A reinforced concrete vault, approximately 31 feet x 30 feet x 27 feet high, will be provided at the tie-in to the existing lines to protect the four service water headers, four new service water line expansion joints, and two new access ports from the adverse effects of tornado generated missiles and effects due to earthquake induced ground motion.
~ The tie-in' piping, buried piping, expansion joints, and access hatches are designed to QA Category I, ANSI B31.7, Class 3 piping requirements. Seismic 15-MDS-583Ca-6
pipe supports will be provided for piping inside the tie-in pit to maintain the integrity of the service water system. The construction of the tie-in vault will be such as to protect the seismic adequacy of the operational service water headers.
The tie-in vault will house the four pressure balanced expansion joints (2-MEJ-21A, 2-MEJ-20A, 1-MEJ-21B, and 1-MEJ-20B), pipe access hatches and the associated cathodic protection equipment.
Platforms for gaining access to the new pipe access hatches have been provided. A 36-inch diameter, 3-inch thick steel manhole is located in the southwest corner of the vault roof for personnel access into the tie-in vault. A 9 foot by 20 foot (approximate) three piece removable equipment hatch is provided for construction and permanent access for equipment installation and removal.
A floor sump is located on the south side of the pit. A sump pump and discharge line will be installed to allow dewatering of the tie-in vault. The drain piping will be 2-inch diameter stainless steel. The sump pump discharge piping will be embedded in the tie-in-vault wall and discharge to grade outside the Vault.
Forty-two inch diameter sleeves will be installed to allow for unanticipated settlement of the tie-in vault without impacting the piping. The pipe sleeves will be sealed and the sleeve seals will allow differential movement between the piping and walls and maintain a sufficient seal to minimize soil and water inleakage into the pit.
The tie-in vault will have a 10 kVA electrical distribution and a grounding system. The electrical distribution system will include a 10 kVA 480V-120V, 1-phase transformer and a 120V distribution panel to power lights, a sump pump and receptacles for small power tools during maintenance and/or space heaters during cold weather when a header is shutdown to prevent freezing.
I Eye bolts will be provided to allow removal of the pipe access hatch covers (36-inch blank flanges). Because of their large size and weight, removal of the pressure balanced expansion joints will require the use of an outside crane through the equipment access hatch, i
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