ML20236A013

Rev 1 to TMI-2 Design Criteria for Pressurizer Defueling Sys. W/One Oversize Drawing

ML20236A013
Person / Time
Site:	Three Mile Island
Issue date:	07/31/1987
From:	Digiacomo L, Potts W, Robert Wolfgang GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20235Z778	List: ML20235Z776 ML20235Z792 ML20236A013 ML20266J638
References
3255-86-0004, 3255-86-0004-R01, 3255-86-4, 3255-86-4-R1, NUDOCS 8707270409
Download: ML20236A013 (19)

Text

-

e DC 3255-86-0004 REV i 1 Nualer eue , ve , eeo l

DATE July 1987

@ ITS O SITE ENGINEERING l

O NSR C PL ANT ENGINEERING O NITS X DEFUELINdi ENGINEERING 1

I TM1-2 i

DESIGN CRITERIA FOR PRESSURIZER DEFUELING SYSTEM i

l Signature Concurring organizational Element Date i Originator /my [/Q [.p-87 Defuelino Enoineerina 6-B-87 Concurred by Q( \hk-r, Responsible Technical Reviewer (- T ?7 l i

9 kbMNJr# Manager, Safety Review Group 6//9[67 {

(. [M d(_ DPM ,hoky Manager of Quality Assurance C[26/97 b1) M. M 'yy WP,M -

Site Operations Director 7/fo/f"7 y

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Approved by hadJs s'oA. [d 'E . d4M WGA. Manager, Def ueling Eng.ineering 7/fo/g7 I!?

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8707270409 G70721 p"" l of^ja PDR ADOCK 05000320 P PDR l

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DC 3255-86-0004 Rev. I Page 2 of ,_1,8_

L'.

TABLE OF CONTENTS .

l SECTION SUBJECT PAGE NO. )

3 1.0 PURPOSE AND SCOPE ..............................>.............

1 3

2.0 REFERENCES

/ CODES / STANDARDS .............'......................

..2...................... .. 6 3.0 Fl!NCTIONS WD DESIGN REQUIREMENTS 1

3.1 Functions ... ......................................... 6 j 3.2 Design Requirements .................................... 10 l 14 {

3.3 Process Requirements ....................................

3.4 Structural Requirements ................................ 15- f I

3.5 System Configuration and Essential Features ............ 15 3.6 Maintenance and In-Service Inspection ................ 4 16 3.7 Instrumentation and Control ............................ 16 b 3.8 Interfacing Systems .................................... 16 3.9 Testing Requirements ................................... 16 3.10 Materials .......................... 1......,........... 17 18 4.0 QUALITY ASSURANCE ............................................ t 5.0 HUMAN FACTORS ................................................ 18

)

i FIGURE;  :

FIGURE 1 PIPING & INSTRUMENT DIAGRAM. PRESSURIZER DEFUELING SYSTEM, DRAWIRG NO. 2C-3255-1132 FIGURE 2 PRESSURIZER GENERAL /)RRANGEMF.NT 1126B RP

DC'bN55-86-0004Rev.1 Page 3 of 18_

.l .0 PURPOSE Af4D SCOPE  :

I i

The purpose of the Pressurizer Defueling $ystem is to remove fuel debris from inside the pressurizer in a systemalic and safe manner. This system will agitate and pump out the estimated 11 kg of fuel debris existing within the pressurizer and '6ny fuel debris which may be flushed into the pressurizer from other ex-vessel defueling operations, such as

pressurizer spray lins defpeling. i l

l J

This design criteria is applicable to the following items which comprise i the Pressurizer Dsfueling System:

• Pressurizer Vacuuming Pump e An agitation water supply line -

6 Supporting accessories whic'n are needed to complete th'e system such as long handled tools, controls, piping, fittings, flexible hosing, ,

etc.

• The existing Defueling Water Cleahup System (DHCS).

2.0 REFERENCES

/, CCODES /STANCARDS 2.1 Referknces L. Bechtel P&ID 2-M74-DHC01, Defueling Water' Cleanup System 1126B RP

(.

DC 3255-06-0004 Rev. 1 Page 4 of 18_

b. Burns & Roe flew Diagram Drawing 2024, Reactor Coolant Make-Up

& Purification

c. Babcock & Hilcox Drawing, Pressurizer General Arrangement, GPU Fil6 #07-00-0110 l

d. TMI-2 Technical Bulletin TB 85-10a Rev. 1, A Reevaluation of i

Fuel in the Pressurizer,

e. TMI-2 Technical Bulletin TB 86-02 Rev, 0, Physical / Radiological Inspection and Sampling of the I

Pressurizer

f. THI-2 Technical Bulletin TB 86-13 Rev. O. Gamma Analysis of

\

Pressurizer Sample l

)

l l g. Babcock & Hilcox Pressurizer Instruction Manual

h. TER 15737-2-G03-106 Rev. 10 "TMI-2 Division Technical  %

Evaluation Report for Defueling Hater Clean-up System"

i. SD 15737-2-M72-DHC01 Rev. O, "THI-2 Division System l

Description for Defueling Water Clean-up Reactor Vessel l

Clean-up System" l

1 .

1126B RP

4

" DC 3255-86-00^4 Rev. 1 ,

Page 5 of 18 2.2 CODES / STANDARDS 2.2.1 The following codes and standards are specifically

~

referenced and shall be applisd as required by this j document.

ANSI N45.2 (1977) Quality Assurance Program Requirements for Nuclear facilities ANSI B16.34 (1981) American National Standards Institute, Valves - Flanged and i Buttwelding Ends ANSI Bl.20.1 (1983) American National Standards Institute, Pipe Threads - General ]

Purpose  ;

ANSI B31.1 (1983 with American National Standards l Winter 1984 addrada) Institute, Power Piping Code l ANSI B16.5 (1981) American National Standards Institute, Pipe Flanges and Flanged Fittings ANSI B16.ll (1980) American National Standards Institute, Forged Steel Fittings,

! Socket Welding and Trireaded i

l .

l ANSIJtJME NQA-1 (1979) Quality Assurance Program Supplement 175-1'and Requirements for Nuzlaar Power Appendix 17A-1 Plants, Supplementary (including Addenda Requirements for Quality NQA-1 a-1981') - Assurance Records i

ASTM A36-1981 American Society of Testing and Materials, Structural Steel ASTM A312/A312M-1985 Seamless and Welded Aystenitic Stainless Steel Pipe.

ASTM A500-1984 American Scciety of Testing and Materials, Cold-Formed Welded and Seamless Carbon Steel Structural i Tubing in Rounds and Shapes i

Il26B RP l

DC 3255-86-0004'Rev. 1 Page 6 of 18 10 CFR 50, Appendix B. General Design Criteria for '

1982 Nuclear Power Plants j s

' OSHA Occupational Safety and Health i Standards, Part 1910, Section ij 1910.179,-1977.

1 OSHA Occupational Safety and Health l Standards, Part 1926, Section  :

1926,550, July 1980.

2.2.2 Should any requirements of this document conflict with '

those of the Code or applicable standards, the more stringent requirement-shall govern. l.

l 3.0 FUNCTIONS AND DESIGN REQUIREMENTS j Refer to Figure 1 for a schematic representation of this system.

l 3.1 Functions i

3.1.1 Pressurizer Vatuuming Pump l

The pump will draw suction from the water inside the pressurizer. This wat.er will contain suspended' particles of fuel debris which the pump is capable of handling during suction. The pump, along with its discharge-piping, will be located within the pressurizer. In order l

l to ensure that the heavier debris is drawn into the pump, the pump unit will be lowered as close as possible to the lower head of the pressurizer.

O I

1126B RP 1 ,

DC 3255-86-0004:Rev. 1-1

'Page: 7 of 18 2.1.2 Agitation Water Supply Line i

Theagitationwatersuppifitnewithanozzleshallbe used to suspend debris p' articles in the pressurizer by l l

using water from the 0WCS. The' position' of the nozzle ]

can be maneuvered using'long handled tools. Since this

'1 is.a closed system, the volume of water entering the agitation supply line-is the same volume as being discharged by the submersible pump. Therefore; the volume 1

of water in the pressurizer remains unchanged.

j 3.1.3 Supporting Accessories Hose shall be used for the agitation water supply line and for the pump discharge. Valves and associated .

i fittings shall.be used to control'the flow of water into and out of the pressurizer. Instrumentation such as

, pressure and flow indicators shall be used to monitor the flow of water in and out of.the pressurizer. Long handled tools shall be used to maneuver the agitation i i

nozzle as required and to position'the pump where To the extent necessery for effective vacuuming' .

practical, valves, instrumentation and pump controls- l shall all be centrally located and within easy reach of the operator.  ;

1126B RP

DC 3255-86-0004 Rev. 1 Page 8 of 18 3.1.4 The existing Defueling Water Cleanup' System (DWCS)

The Pressurizer Defueling System utilizes a portion of the DWC System to provid'e a flow path back to the reactor vessel. Inherent in the design of the DHC System, is the  ;

capability to use filter canisters and/or knockout canisters as part of the process stream to illter and b remove fuel debris. Although this debris separation capability exists, and may be used if defueling conditions warrant, present baseline plans are to bypass .

I the filter canisters and return the prescess stream directly to the reactor vessel.

The DHCS can also be configured as described beiow. ld The existing DHCS train "B" shall be used to filter the water from the submersible pump discharge prior to returning it to the pressurizer via the agitation supply line. Water from the pressurizer will enter a knockout canister prior to returning to the reactor' vessel or d  !

being filtered. This knockout canister will retain those particles exceeding 800 microns in size. The water will then be routed to the reactor vessel or to a DHCS filter ld canister. The filter canisters for DHCS are capable of removing debris down to 0.5 micron in size. This would ensure that water entering the pressurizer through the agitation supply line is sufficiently clean to prevent 1126B RP-

DC 3255-86-0004 Rev. I 1 j

Page 9 of 18 fuel debris from returning to the water inside the i pressurizer, l

i

< ~

During operation of the Pressurizer Defueling System.

Train B of DHCS will not be iri operation except for the Train B filter canisters (F3 & F4).- The remaining DHCS  !

can be isolated by closing valves V004B_and Vo07B and i 1

opening V003B (if filter canister F 3 is to be used), or l

by closing valves V0048 and V003B and opening V0078 (if f filter canister F-4 is to be used). This will ensure that DPIT-58 will monitor the differential pressure across the filters. Valve V356 will also be closed and 1 V357 will be open. This will create a flowpath from the l submersible pump back to the agitation supply line.

l During operation of Train B the Pressurizer Defueling System will not be in operation. The Pressurizer Defueling System can be isolated from DHCS by closing ,

valves DHC-V357 and V501.

Allowing the ability to operate either DHCS or the Pressurizer Defueling System by valve alignment will maintain body feed /precoat on the DHCS filters.

l ll26B RP 1

DC 3255-86 -0004 Rev. 1

- Page 10 of 18 3.2 Design Requirements 3.2.1 Pressurizer Vacuuming Puop The pump shall be a vertical submersible pump. .The pump i shall operate at 100 gpm whicn will ensure sufficient 1

velocity to transport fuel debris solidt. The pump shall operate at approximately 300 feet total head, with a shutoff head of approximately 450 feet'. The pump shall.

be furnished and delivered completely assembled. The pump shall be powered by an electr'c motor rated for 460 volts, 3 phase, 60 Hz and have an integral cooling i

system. The pump shall be capable of handling particle sizes up to 1/4" in size. A minimum of 50 feet of power cable shall be supplied with the pump. The pump will be handling radioactive, borated, reactor vessel water with the chemistry described in Section 3.3. The pump shall be capable of being operated in air without damage. The overall dimensions of the pump shall be such that it can be placed down to the lower head of the pressurizer.

3.2.2 Agitation water supply line Water will be introduced into the pressurizer using a hose with a nozzle at one end. The hose diameter will be sized to accommodate the flow of the submersible pump.

l l

1126B RP

.____--_______O

DC 3255-86-0004 Rev. 1 Page 11 of 18

.The nozzle will have sufficient discharge velocity to 1 promote agitation of debris.in the pressurizer. The configuration of the nozzle shall be such that agitation

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occurs in all directions with a minimum of manual  ;

manipulation. The nozzle shall be stainless steel, shall I

have a full cone spray pattern with uniform distribution, and shall be of sufficient size to avoid clogging.

3.2.3 Supporting Accessories l

Hose for the pump discharge and agitation supply line l shall be rated for the maximum discharge pressure of the submersible pump. The hose shall be as continuous as l

I practical to minimize connections. Hose fittings to adapt to steel pipe shall be provided. Valves used to control flow shall be stainless steel conforming to ANSI Standards. Valves shall be temporarily supported as required. Flow indicators shall be installed on the supply and discharge lines. A pressure indicator shall be used on the discharge line. Minimum tap sizes for i flow and pressure indicators shall be 3/8" in order to prevent clogging by' fuel debris. These same instruments shall be located on the top of horizontal pipe to avoid being plugged from settlement of debris during no flow conditions. An On/Off switch for the submersible pump shall be provided. Existing long handled tools shall be ll26B RP

DC 3255-86-0004 Rev. 1-

• Page 12 of 18 utilized to the greatest extent possible. Design of special tools shall be minimized.

Hose and piping will be hydrostatically pressure tested prior to use to ensure against any potential line break or failure. In the unlikely event of a hose rupture or line rupture upstream or downstream of the submersible pump the system will trip the pump on IIF low level and alarm at the control panel located on the pressurizer missile shield. The pump will trip on IIF low level because it will be electrically interlocked with the reactor vessel cleanup pump which would trip on IIF low level (Reference h). This event coul.d deliver approximately 500 to 1000 gallons of reactor vessel water to the area of the break.

1 Siphoning of reactor vessel water from the pressurizer through the agitation supply line is prevented by the placement of a check valve in close proximity to the i pressurizer. This check valve will prevent water from flowing out of the pressurizer should a hose break occur inside the pressurizer. A hose break in the submersible pump discharge line is of no concern with respect to siphoning, since all unsubmerged piping and hose outside l of the pressurizer is at or above the Reactor Vessel water level.

l 1126B RP l

DC 3255-86-0004 Rev. 1 Page 13 of 18 3.2.4 The Existing Defueling Water Cleanup System (DHCS)

I The preferred flowpath would provide agitation supply water from either DHC-V357 (Train "B") or DHC-V363 (Train l "A"). The discharge water from the submersible pump 2bi would be routed to a knockout canister and then directly l to DHC-V358 (Train "B") which would then flow into the reactor vessel.

An optional flowpath would be as follows. jfi Water discharging from the vacuuming pump will first be i

routed to the knockout canister. The water will then be directed to filter canisters F-3 and F-4 downstream of a

valves DHC-V003B & V0078 respectively. Two new valves DHC-V360 and V361 will be installed between V003B and i I

l V007B and filter canisters F-3 and F-4. These new l l

valves will be used to control flow to the filter canisters and will be also be used to bypass the filter g canisters if required. Valve DHC-V501 will be installed l to be used as an isolation valve between DHCS and the Pressurizer Vacuuming Pump discharge line. Water to the agitation supply line will enter through valve DHC-V357.

1126B RP

DC 3255-86-0004 Rev. 1-Page 14 of 18 3.3 Process Requirements The complete Pressurizer Defueling System shall be used inside the

~

reactor building and be capable of operating continuously as required.

l The design temperature for components in air (hotes, valves, etc.)

is 50*F to 130*F, relative humidity of 5 to 100% and pressure of 14.7 psia atmospheric pressure to not less than 12.2 psia.

Components in the pressurizer (submersible pump, nozzles, hose, etc.) shall be designed for external pressure ranging from.

0-10 psig and the following maximum water chemistry conditions:

l Boric Acid 4350-6000 ppm boron pH 7.5 - 8.4 Chloride 5 ppm f l

Temperature 50-200*F Defueling performance shall be monitored as required. During the conitoring activity, the vacuuming pump shall be turned off and the water in the pressurizer shall be calm. A video camera will be l l

used to determine the amount of debris remaining. Defueling is then resumed as necessary. Those particles which cannot be vacuumed will be removed using long handled tools as required. The  !

flow of water from the pressurizer shall be monitored to ensure 1126B RP

R I

DC 3255-86-0004 Rev. 1 {

Page 15 of 18  ;

i that the vacuuming pump has not clogged. The flow shall be monitored using the flow indicator on the Pressurizer Defueling-System, the video camera in the pressurizer and the flow recorders on the DWC system. Since the pump is eauipped with a screen it is unlikely that the pump will clog. .llowever, should it be necessary to unclog the pump screen, a backflush can be performed.

3.4 Structural Requirements I

Structural components shall be designed in accordance with the ANSI B31.1 code. Structural components shall be designed for equipment dead loads, operating loads, and containment environmental conditions given in Section 3.3. All structural. welding shall be done in accordance with the ANSI B31.1 code. All piping shall be-in accordance with ANSI B31.1.

3.5 System Configuration and Essential Features a j The system will be handling radioactive water. The system shall be designed so that doses t<> personnel are limited to those which are as low as reasonably achievable (ALARA). The. system will be I

located inside the reactor building. Figure 2 shows a general l

arrangement of the pressurizer.

l

[

l 1126B RP

(

DC 3255-86-0004 Rev. 1 Page 16 of 18 3.6 Maintenance and In-service Inspection Fluids and lubricants used for the vacuuming pump shall be

~

acceptable for use in the RCS and their quantitles shall be minimized. Where feasible, fluids should be miscible and/or less dense than the pressurizer vessel water to preclude boron dilution concerns.

L 3.7 Instrumentation and Control I

The vacuuming pump shall have an On/Off switch accessible from the l platform at the top of the pressurizer. Manually operated valves shall be provided or the agitation supply line and pump discharge line. These valves shall be located outside of the pressurizer. l Flow indicators shall be installed on both supply and discharge l l l

lines along with a pressure indicator on the discharge line.

Balancing the water flow for the Pressurizer Defueling System will be minimal since this is a closed loop system. However, valve alignment on DWCS must be performed to ensure that water leaving the pressurizer will not escape through unwanted flow paths.

3.8 Interfacing Systems The electrical power supply that will be available is 460 volt, 25 amp, 3 phase, 60 Hertz AC for continuous service.

Il26B RP l

DC 3255-86-0004 Rev. 1 4 Page 17 of 18 The Defueling Water Cleanup System is used~as a means of filtering the water being removed from the pressurizer.

3.9 Testing Requirements 1 i A functional test of the pump shall be performed. prior to installation into the pressurizer.

Hydrostatic pressure testing is. required of all piping and hoses.

The test pressure shall be 225 psig and shall be performed in accordance with ANSI B31.1. The pressure shall be held for 10 i

l minutes. This is' compatible with the OHCS test pressure and i provides enough margin to ensure that the maximum pressure delivered by the pressurizer vacuuming pump (195 psig) is within the test pressure. Testing of the hose will be performed after ]

couplings have been attached. Pipe and hose may be tested outside of the Reactor Building.

'l All connett'.ons will be initial service leak tested after the piping and hose are assembled.

3.10 Materials q

Materials selected shall be suitable for-the use intended and for l plant environmental conditions such as radiation, temperature and:

wetting with borated water. Wherever practica'l. 300 series 'l i

i 1126B RP <

y p .

,Y J. i DC'3255-86-0004 Rev. 1 Page ~18 of 18  !

stainless steel components shall be used. Hoses shall be made of

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rubber. l l

l

<4.0 OUALITY ASSURANCE j i

l- This system is ' classified'as important to safety.

5.0 HUMAN FACTORS ]

Hose shall be used to allcw for quick. installation and use of existing radiation shielding. Hoses and valves shall be properly identified by metal tags or banded to avoid disconnection or confusion. Quick disconnect couplings shall be used for ease of assembly and removal.

" Design features" such as special fittings and color coding shall be ,

1 used, if possible, to preclude any potential boron dilution or loss of 1 I

I Reactor Vessel inventory.

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1126B RP l

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OVERSIZE DOCUMENT PAGE PULLED ,

SEE APERTURE CARDS NUMBER OF OVERSIZE _ PAGES FILMED ON APERTURE CARDS APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC FTS 492-8989 1 i

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